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Sometime in April next year, me and V (Klebold) will get revenge and we'll kick natural selection up a few notches...It'll be like the L.A. Riots, the Oklahoma bombing, WWII, Vietnam, Duke and Doom all mixed together...I want to leave a lasting impression on the stupid world.
Typed rant by Harris

Eric David Harris and Dylan Bennet Klebold were a pair of school shooters, bombers, and mass murderers responsible for the April 20, 1999 Columbine High School Massacre in Columbine, Colorado, which killed thirteen people and wounded 21 others before ending with both of their suicides.


Eric Harris


Young Harris.

Harris was born in Wichita,


Kansas, on April 9, 1981. His father Wayne was a U.S. Air Force transport pilot who held eleven different positions in six bases at Ohio, Michigan, and New York. This forced the Harris family to move around frequently before Wayne was forced to retire in 1993 due to cutbacks and he became a part-time caterer. At this time, on the month of July, the family settled down in Littleton, Colorado, where they lived in a rented property for three years. While attending Ken Caryl Middle School, he met Klebold and the two became good friends. In 1995, Harris started attending Columbine High School, and the following year, the Harris family bought a house not far from Columbine. Eric's older brother Kevin was a popular athlete at Columbine and studied at the University of Colorado at Boulder. The first warning signs of his increasingly-hostile personality emerged during his freshman year at Columbine when he met Tiffany Typher in German class and the two went to homecoming together. Typher then didn't allow Harris to go out with her again (for unspecified reasons), to which Harris staged a fake suicide in which he sprawled himself on the floor with fake blood washed over him. Later, he wrote "Ich bin Gott" (a German translation for "I am God") on her yearbook. That same year, he and Klebold both found employment in Blackjack Pizza, a local pizzeria, where they would eventually meet Mark Manes, a man who would sell the TEC-DC9 semiautomatic pistol used in the massacre to them. Harris's increasingly unstable behavior later prompted Wayne to start a journal chronicling his son's emotional problems.

Dylan Klebold


Young Klebold.

Klebold was born in Lakewood, Colorado, on September 11, 1981. His


father Tom ran a small real-estate business from home and his mother Susan was an employment counselor. The Klebolds attended a Lutheran church, but also observed some Russian Jewish rituals, as Klebold's maternal grandfather believed in the religion. For the first and second grade, he attended Normandy Elementary School, then transferred to Governor's Ranch Elementary and became a member of CHIPS (Challenging High Intellectual Potential Students), a Colorado-based program for gifted children. He was also heavily involved with sports as a child. Transitioning into Ken Caryl Middle School (a process that was found by Klebold as extremely difficult), he met Harris and the two became good friends. Klebold then went to Columbine High School with Harris, becoming involved in the behind-the-scenes crews in school play productions, video productions, and the school's news network. He briefly became a hero for saving one of the school plays during a showing when the music started becoming distorted and Klebold provided a backup tape to continue the music; ironically, Rachel Scott, the first fatal victim of the massacre, starred in that particular play at the time.

Early Criminal Activities

Columbine High School

Columbine High School.

According to early accounts of the shooting, Harris and Klebold were very unpopular students and frequent targets of bullying at their high school, including homophobic remarks. They eventually began to bully other students; Harris and Klebold had written journal entries about how they themselves had bullied younger students and "fags". Klebold wrote that he tried not to pick on others, which seems to match with more recent hypotheses that Harris was the ringleader. Later, Harris began hosting a website where he posted home-made levels of Doom, a first-person shooter game which was notorious for its graphic violence and gore, and also of Quake. The levels later became known as the "Harris levels". Harris also began posting his personal thoughts about his parents, friends, and school, but later started putting up instructions on how to make crude explosive devices and venting his personal hatred of people he knew, in particular fellow students, mostly school athletes who bullied him and Klebold for four years, and faculty members at their high school, Columbine High. In 1997, the parents of one of Harris's classmates, Brooks Brown, filed a formal complaint against him when they found a death threat directed at their son. Sometime earlier, Harris had thrown a chunk of ice at Brown's car. A book written by Brown later stated that the incidents occurred after Harris, for whom he gave rides to, complained about him being chronically late, to which Brown eventually told him to "find another ride to school", infuriating Harris.

On January 30, 1998, Harris and Klebold had broken into a van and stolen electrical equipment. They were later arrested on felony charges of criminal trespassing and theft and were sentenced to psychiatric treatment, counseling and community service. Harris also received anger management treatment and made such a good impression on his probation officer that their treatment program ended a few months early. After completing his court hearing, Harris seemed compliant. In his anger management essay video, he said: "I'm happy to say, that with the help of this class, and some other diversion related experiences, I do want to try and control my anger." In his private journal, however, he expressed nothing but anger and resentment about being prosecuted. Their encounter with the law revealed the existence of a kind of parallel universe. While outwardly apologetic and reformed, Harris and Klebold were bonded by a shared rage. Klebold wrote in Harris's 1998 yearbook: "My wrath from January's incident will be GODLIKE! Not to mention our revenge in the Commons [the Columbine cafeteria]." Though Harris had removed the death threats from his website after his and Klebold's court hearing, he began putting up records of his gun collection, which they obtained by having friends buy the weapons for them, bomb-making, and even a hit list of specific people he intended to target in his and Klebold's upcoming massacre. At one point, Harris tried to enlist in the U.S. Marine Corps, but his application was rejected because he was taking the antidepressant Luvox (his autopsy showed therapeutic levels of the drug in his body). A local sheriff once drafted an affidavit for a search warrant for Harris' home, but it was never filed.

Violence was very prominent in Harris and Klebold's school work. Together, they made a video titled Hitmen for Hire in which after being hired by a bullied student as mercenaries, they walked around the school's hallways with fake guns and pretended to shoot students that messed with their client. At the end of the video, they screamed at the camera, threatening to kill any person that messed with their former client. They both also wrote violent stories for their creative writing assignments and made video recording where they discuss their motivations. These tapes would eventually be called "The Basement Tapes", for all but one of the tapes were recorded in Harris' basement. In one tape made very shortly before the massacre began, they say goodbye to their parents and made a verbal will, naming friends and what they could have. Klebold wrote a short will in the last entry of his journal. A few days before the shooting, Klebold went to the prom with Robyn Anderson as his date. Anderson had bought the rifle and the shotguns used in the massacre because she was eighteen (the legal age limit to purchase a firearm in Colorado) while Harris and Klebold were still seventeen. They deceived her by saying they meant to cause no harm and only wanted them for harmless fun, shooting or hunting deer.

The Massacre

"Today the world's going to come to an end. Today's the day we die."

-Harris while in the cafeteria

Columbine staircase body

SWAT escorting students out of the school cafeteria. The body at the bottom of the stairs is Daniel Rohrbough.

At 11:10 a.m. on April 20, 1999, Harris and Klebold arrived at Columbine High in separate cars and armed two 20 pounds (ca. 9 kg) homemade propane bombs inside the cafeteria. Before Harris left his car, he ran into Brooks Brown. After they talked for a moment, Harris told Brown, "Brooks, I like you now. Get out of here. Go home." Brown promptly left the premises. Prior to the shooting, Harris and Klebold had placed a propane bomb ca. half a mile (ca. 800 m) from the school, presumably as a diversion. The bomb only partially detonated and caused a small fire that was put out by the fire department. The pair's plan was to detonate the propane bombs inside the school, causing everyone inside to flee through the main exits, and then open fire at them from vantage points as they came running out. When ambulances, police, the fire department and the press arrived on the scene, time bombs set up inside their cars would detonate to strike them as well. Klebold's car bomb detonated when the police tried to defuse it, but no one was hurt. As for the cafeteria bombs, they malfunctioned and failed to detonate in a fortunate circumstance.

Columbine library map

May layout of the Columbine library. Dots at the bottom refer to the exact locations of victims and witnesses.

After waiting a while, Harris, and Klebold armed themselves and went inside through the West Entrance instead. They first threw a pipe bomb, which detonated, but didn't do any damage. The first to be shot were Rachel Scott and Richard Castaldo, both 17, who were sitting on a grassy knoll; Rachel was killed instantly by four shots, while Richard was severely injured and paralyzed by eight shots. It was later rumored that Harris and Klebold targeted Christians and first asked Scott whether she believed in God and gunned her down when she said, "You know I do." Castaldo reported this, though the FBI later concluded that it didn't happen. After killing Daniel Rohrbough, as well as injuring seven more students and teacher Patti Nielson, Harris and Klebold entered the school. Harris then briefly engaged in a gun battle with school reserve officer Niel Gardner, but after Harris' carbine jammed and the bullets stopped flying, he and Klebold continued their rampage inside the school, injuring another student and critically wounding teacher Dave Sanders, who saved many lives by evacuating the cafeteria with two other staff members. Sanders crawled into a science classroom full of 30 students, two of which administered first aid to him, but he died at approximately 3:00 p.m.

Columbine cafeteria

Famous security footage of Harris and Klebold in the school cafeteria.

At 11:26 a.m., they entered the library, which contained a total of 56 hiding students and staff. Harris injured a school athlete, Evan Todd, and Klebold killed a special-education student before they both reloaded their guns. When Harris said "Let's go kill some cops", they both proceeded to have another shootout with Denver police, but no casualties were taken on either side. Then, Harris and Klebold killed nine more students and injured eleven in the deadliest part of their massacre. All the while, they taunted students, even using racial slurs, and screamed their rage. They left the library at 11:36 a.m. after seven minutes of killing students. Their movements through the school then seemed directionless, shooting into empty rooms. They once threatened students hiding in a restroom, but didn't go in. They even made eye contact with students through door windows, but did not enter any classrooms. They then entered the cafeteria in an attempt to detonate their bombs. Harris made his first suicide bit by firing his carbine at one of the bombs, but it failed to detonate. They walked around, taking sips from cups left by students. A Molotov cocktail thrown by Klebold managed to only partially detonate one of the bombs, causing a fire. They walked through the school, reentered the cafeteria and the kitchen, then made their way back to the library. After having a third, brief shootout with the police and lighting a Molotov cocktail on a table, Harris and Klebold turned their guns on themselves and committed suicide by shooting themselves in the head, ending the 49-minute-long rampage.


Chris Morris

Chris Morris (right).

After the massacre at Columbine, the local police came under a great deal of criticism, both for not entering the school sooner and also for not searching Harris' home before the incident. The former later led to the introduction of Immediate Action Rapid Deployment, a police tactic where they actively approach a situation that could become immediately life-threatening to the public, such as in cases where the perpetrators are in possession of dangerous weapons, such as firearms, explosives, and/or WMDs. David Cullen, the author of the non-fiction book Columbine, credits this tactic with saving a lot of lives during similar situations, including the 2007 Virginia Tech massacre. The American school system was also affected; many schools heightened their security by implementing metal detectors, security guards and having students wear computer-generated ID cards and also introduced zero-tolerance policies against bullying, though a study made by the U.S. Secret Service concluded that it probably wouldn't be helpful. Violence in media was also examined when it came out that Harris and Klebold were fans of Doom, Quake, Wolfenstein 3D, and violent movies such as Natural Born Killers. A number of victims of Columbine and/or their families filed lawsuits against school officials, law enforcement, the manufacturer of the drugs which Harris had been prescribed, the people who helped him and Klebold get the guns they used, and even Harris and Klebold's parents. All of them were either settled or dismissed.

Charles Andrew Williams

Charles Andrew Williams.

Alex Hribal

Alex Hribal.

Seung-Hui Cho

Seung-Hui Cho.

Also, rumors and conspiracy theories were made that there was at least one more shooter involved, including a rooftop gunman. This "gunman" was later identified as a custodian making repairs to the vents. One student that was suspected of being a potential third shooter was Chris Morris, a member of the Trench Coat Mafia. While he was not involved, Harris had attempted to recruit him for the massacre three times, starting on March 20, 1999. Chris refused on all counts, thinking Harris was just joking. Another theory was that Harris murdered Klebold before committing suicide. This theory was supported by the fact that Klebold was left-handed and the gun that was used, the TEC-DC9, was found in his right hand, and also because he was half-Jewish on his mother's side, which Harris was alleged to have disliked.

Kimveer Gill

Kimveer Gill.

The massacre prompted many incidents of teenagers attempting to commit similar shootings at their schools, or teenagers becoming inspired to commit school shootings. While most of these attempts were prevented before they could even take place, there were four instances where a plan to emulate Harris and Klebold succeeded. It should be noted that all four examples didn't involve any exact replication of Harris and Klebold's M.O., the perpetrators being merely inspired by the pair. They are:

  • Todd Cameron Smith, a student at W. R. Myers High School in Taber, Alberta, Canada, who, on April 28, 1999 (just eight days after the Columbine massacre), shot at three students with a sawed-off .22-caliber rifle, killing one and injuring another. He was then apprehended by a gym coach. Possible motives were stated to be bullying and depression. Before going to trial, Smith temporarily suffered diminished mental capacity after falling into a coma during open-heart surgery meant to fix a heart ailment. He was eventually found guilty and sentenced to three years in prison and seven years of probation. Smith escaped after being released into a halfway house on March 2005, but turned himself in the next day and was most likely incarcerated again. Since then, Canadian media outlets have been disallowed to use Smith's name and photograph ever again.
  • Thomas "TJ" Solomon, a student at Heritage High School at Conyers, Georgia, who, on May 20, 1999 (the one-month anniversary of the Columbine massacre), shot and injured six students with a .22-caliber long rifle. He then attempted to commit suicide with a .357-caliber revolver, but was talked down by an assistant principal. Solomon was then sentenced to 40 years in prison despite being recognized as mentally ill; the sentence was commuted to 20 years in 2001, making him eligible for parole in 2017, when he will be 33 years old.
  • Charles Andrew Williams, a student at Santana High School at Santee, California, who, on March 5, 2001, shot and killed two students and injured an additional 13 with a .22-caliber revolver before surrendering to authorities. This shooting was the deadliest shooting at a high school since Columbine until the Red Lake massacre. There was no definite motive revealed for the shooting (though friends have stated that it might be bullying), and Williams was sentenced to 50 years in prison and will be eligible for parole in 2052, when he will be 66 years old.

Alex Hribal, a student at Franklin Regional High School at Murrysville, Pennsylvania, who, on April 9, 2014 (Harris's 33rd birthday), attacked dozens of students with two knives taken from his kitchen, injuring 22 people, including a school resource officer, before being subdued by an assistant principal and a student. The attack was one of rare but nonexistent instances of mass stabbings in the U.S., as well as the first multiple-casualty mass stabbing to occur at a high school. No definitive motive has yet to be revealed for the stabbing, although it was revealed that Hribal


Adam Lanza

was depressed and suicidal, and was also influenced by Harris and Klebold, having intended to commit the attack on April 20, 2014 (the fifteenth anniversary of the massacre).


  • Seung-Hui Cho, the perpetrator of the Virginia Tech massacre in 2007 that killed 32 people, and Kimveer Gill, the perpetrator of the Dawson College shooting in 2006 that killed one person and wounded 19 others, were influenced by Harris and Klebold, with the former even naming them as "martyrs" in his personal journals and videos, and the latter even (apparently) attempting to copycat the massacre by equipping himself with similar attire and weapons.
  • Outside of school shootings, Vester Lee Flanagan II, the perpetrator of the on-air murders of journalists Alison Parker and Adam Ward in 2015, closely identified with rampage killers in the U.S., especially Harris and Klebold.
  • Adam Lanza was into school shootings such as the Columbine and the Northern Illinois University shootings
  • Nikolas Cruz, the perpetrator of the Marjory Stoneman Douglas High School massacre also showed signs of mental health problems and praised school shooters of the past.

Possible Motives

Harris journal

An excerpt of Harris's journal. (WARNING: GRAPHIC LANGUAGE)

In the wake of the massacre and years following it, the motivations behind the event have been heavily disputed amongst both investigators and the general public, as Harris and Klebold's writings in their journals never explicitly confirmed them. Violent video games and their role in American society have also come under fire when it was revealed that Harris and Klebold were fans of several of them, as aforementioned, with their favorite game being Doom, which Harris created new levels for. In the book Columbine by Dave Cullen, it states that Harris and Klebold, according to their attempt at a more grandiose, elaborate, and terrifying attack than the one they committed, wanted to commit the deadliest terrorist attack the U.S. has ever seen, by killing 240-500 people as planned; this seems to be supported by the focus on how they envisioned their assault found in both shooters' journals. In The Final Report, it has been stated that the massacre was an act of revenge against the local law enforcement following their January 30, 1998 arrest and bullies. In the Zero Hour documentary, it states that Harris's journals and video recordings clearly reveal a disturbed mind that concocts grandiose and destructive schemes, while Klebold's emotions are a mystery, though he did seem to be reduced to a gesture of repressed rage as the massacre in the library came to an end.

Klebold journal

An excerpt of Klebold's journal. (WARNING: GRAPHIC LANGUAGE)

Psychiatrists have diagnosed Harris as a psychopath and Klebold as a manic-depressive respectively and believe that these two mental conditions influenced the two: Harris was influenced by sadism, Klebold revenge against those he was jealous of. For Harris, a list of hallmarks of psychopathy in juveniles was created by Dr. Robert Hare. It consisted of gratuitous lying, inability to feel remorse or guilt, indifference to the pain of others, defiance of authority figures, unresponsiveness to reprimands or threatened punishment, petty theft, persistent aggression, cutting classes and breaking curfews, cruelty to animals, early sexual promiscuity, vandalism and setting fires. Harris showed all of these except for animal cruelty (he wrote that he cried when his dog died). As for Klebold, he was consumed by despair and depression. He described himself in his journal as a "god of sadness" and summed up his life as "the most miserable existence in the history of time". He fell in love with a Columbine student, filling page after page with hearts and wrote about her, including letters that he didn't send to her, but apparently, she didn't return his feelings or even knew him. "I have no happiness, no ambitions, no friends and NO LOVE!!!".

The general public's most popular and widely-accepted theory of Harris and Klebold's motivation was four years of bullying by school athletes (known in the school as "jocks", who wore white baseball caps) and popular students. Harris wrote twice that "everyone" was always making fun of him, sometimes directly in his face, and that he would get revenge. They both spoke of their rage caused by their abusers to their video camera. Another recording also caught Harris, Klebold and another friend getting elbowed in the face at school by Columbine athletes and almost knocking the video camera out of Klebold's hands. Klebold even complained that his own older brother Bryon and his friends constantly "ripped on" and made fun of him and that "everyone but my family treated me like the runt of the litter". At one point during the massacre as they entered the school library, Klebold screamed their motive, "Everybody with white hats stand up! This is for all the s**t you've given us for the past four years!" Also, Nathan Vanderau, a friend of Klebold, and Alisa Owen, Harris' eighth-grade science partner, have both reported that Harris and Klebold were constantly picked on, the former noting that a "cup of fecal matter" was thrown at them. Chad Laughlin described an event were Klebold was pelted with ketchup covered tampons by seniors. Despite these facts and statements, this motive continues to remain unconfirmed as Harris and Klebold never mentioned their motives, as mentioned above.

Modus Operandi

Harris and Klebold arrived with a huge arsenal of weapons, making them possibly the most heavily-armed school shooters in American history, rivaling Charles Whitman's arsenal. Harris shot his victims with either a 9mm Hi-Point 995 Carbine rifle (his usual weapon of choice) or a 12-gauge Savage 67H pump-action, sawed-off shotgun. Klebold used a 9mm Intratec TEC-DC9M semiautomatic handgun (his usual weapon of choice) and a 12-gauge Stevens 311D double-barreled, sawed-off shotgun against his victims. The two also had two knives each, which they intended to use under the occasion that they were disarmed by resistance, or if they found killing their victims by shooting "boring". The knives were never used, despite Klebold saying "Maybe we should start kniving [sic] people, that might be more fun" after they said the thrill of shooting victims was gone.

Columbine firearms

The firearms used by Harris and Klebold during the massacre.

Columbine pipe bomb

One of the pipe bombs used by Harris and Klebold during the massacre.

Harris and Klebold's most notable portion of their large arsenal were their total of 99 explosive devices. They used three 20-pound propane bombs: two were placed in the cafeteria but failed to completely detonate, though one partially detonated during the massacre via a Molotov cocktail (How do you manage to fuck up a molotov cocktail?); the third was placed far from the school as a diversion, but it partially detonated. Klebold and Harris also used 48 carbon dioxide (CO2) bombs, 27 pipe bombs, eleven 1.5-gallon propane bombs, and seven gas/napalm bombs and Molotov cocktails. They also left booby-trap bombs in their cars that were timed to detonate when emergency personnel arrived. Only Klebold's car bomb detonated, but at 11:00 p.m. instead of 11:00 a.m. as planned, after police attempted to defuse it; no one was hurt.

Known Victims

All the following crimes took place in Columbine, Colorado

  • January 30, 1998: A victimless theft (stole electronic equipment)
  • April 20, 1999: The Columbine High School Massacre


Columbine victims

The thirteen victims killed in the massacre.

  • The shootings outside:
    • Rachel Scott, 17 (shot four times in the arm, ribcage, head and leg by Harris)
    • Daniel Rohrbough, 15 (shot in the leg by Harris, then killed by a shot to the chest by Klebold)
  • Dave Sanders, 47 (teacher; shot twice through the back by both shooters in a school hallway and died of subsequent exsanguination)
  • The school library massacre:
    • Kyle Velasquez, 16 (shot twice in the head and back by Klebold)
    • Steven Curnow, 14 (shot through the neck by Harris)
    • Cassie Bernall, 17 (shot in the head by Harris)
    • Isaiah Shoels, 18 (shot in the chest by Harris)
    • Matthew Kechter, 16 (shot in the chest by Klebold)
    • Lauren Townsend, 18 (shot in the head and chest by Klebold)
    • John Tomlin, 16 (shot in the abdomen by Harris, then killed by shots to the head and neck by Klebold)
    • Kelly Fleming, 16 (shot in the back by Harris)
    • Daniel Mauser, 15 (shot in the face by Harris)
    • Corey DePooter, 17 (shot in the arm by Harris, then killed by shots to the neck and chest by Klebold)


Richard Castaldo

Survivor Richard Castaldo.

Lance Kirklin

Lance Kirklin, who was shot in the neck and jaw by Klebold.

Evan Todd

Survivor Evan Todd.

  • The shootings outside:
    • Richard Castaldo, 17 (shot eight times in the left arm, chest, back and abdomen by Harris; paralyzed from the chest down)
    • Sean Graves, 15 (grazed in the ear, then shot four times in the back, abdomen and foot by Harris; was briefly paralyzed)
    • Lance Kirklin, 16 (shot in the foot, right leg and chest by Harris, then critically wounded by a shot to the neck and jaw by Klebold)
    • Nicholas Foss, 18 (superficially grazed in the forehead by either Harris or Klebold)
    • Michael Johnson, 15 (slightly injured by wounds to the face, arm and leg inflicted by Harris)
    • Mark Taylor, 16 (shot eight times in the leg, chest and back by Harris)
    • Anne-Marie Hochhalter, 17 (shot in the chest, abdomen, back and left leg by Harris; was paralyzed)
  • The hallway rampage:
    • Brian Anderson, 16 (injured by flying glass caused by gunfire by Harris)
    • Patti Nielson, 35 (teacher; hit in the shoulder by shrapnel from gunfire by Harris)
    • Stephanie Munson, 16 (slightly wounded by a shot to the left ankle inflicted by Klebold)
  • The school library massacre:
    • Evan Todd, 15 (slightly injured by splintering from a desk caused by two shots from Harris)
    • Patrick Ireland, 17 (shot in the arm and leg by Klebold, then critically injured by shots to the head and foot inflicted by Klebold)
    • Numerous unnamed cops (attempted to shoot)
    • Daniel Steepleton, 17 (shot in the left thigh by Klebold)
    • Makai Hall, 18 (shot in the right knee by Klebold)
    • Kacey Ruegsegger, 17 (neck was grazed and shot through the right hand and in the right shoulder by Harris)
    • Mark Kintgen, 17 (shot twice in the head and shoulder by Klebold)
    • Lisa Kreutz, 18 (hit by the same bullet as Valeen Schnurr; shot in the shoulder and hand by Klebold; shot again in the arms and thigh by Harris)
    • Valeen Schnurr, 18 (hit by the same bullet as Lisa Kreutz; shot in the chest, left arm and abdomen by Klebold)
    • Nicole Nowlen, 16 (shot in the abdomen by Harris; also wounded in the back by splintering from a desk caused by gunfire from Harris)
    • Jeanna Park, 18 (shot in the right knee, right shoulder and left foot by Harris)
    • Jennifer Doyle, 17 (shot in the hand, leg and shoulder by Harris)
    • Austin Eubanks, 17 (grazed in the knee and shot in the hand by Klebold)
  • Note: Another teacher and two to three other students were injured making their escape, but not by bullets or bombs. Most of these injuries were sustained by falling from the vents.


Johnson and Golden

Mitchell Johnson (left) and Andrew Golden (right).

  • The Columbine High School massacre was originally the deadliest high school shooting in U.S. history until it was surpassed by the February 14, 2018 Stoneman Douglas High School shooting (17 deaths and 17 injuries).
  • School shooters usually work alone, not in teams, for an extensive variety of reasons, mostly socially- or psychologically-related. However, while the prospect of two school shooters working together is an uncommon event, it should be noted that Harris and Klebold aren't the first examples of such. Other examples are:
    • Mitchell Johnson and Andrew Golden, the perpetrators of the March 24, 1998, Westside Middle School massacre that left four female students and a female teacher dead. It was the deadliest mass shooting to take place at an American middle school and the deadliest mass shooting at an American school before Columbine. Both were charged as juveniles and eventually released after completing their respective sentences, though Mitchell Johnson was arrested and incarcerated again for unrelated drug and unlicensed firearm charges.
    • On May 6, 1925, a massacre occurred at a high school in Wilno, Poland. Details are extremely sketchy as to what happened during the massacre. One source says that two students opened fire on teachers and students after failing their exams before throwing hand grenades and committing suicide, effectively killing four students and a teacher; another source says that three students led a school rebellion, two of them opening fire on teachers, with the massacre ending after the third student accidentally dropped a hand grenade, which exploded and killed him, his two partners, the principal, and a student.
  • Harris and Klebold's original plan for the massacre resembles Andrew Kehoe's attack on the Bath School. Both attacks started with a diversionary explosion, followed by the bombing of the school, then the detonation of car bombs. The biggest difference is Harris and Klebold's original plan failed, with their bombs fizzling and only partially detonating in some cases, with no loss of life due to the explosions.

On Criminal Minds

  • Season Two
    • "The Perfect Storm" - Harris and Klebold were mentioned as an example of killing teams.
  • Season Six
  • Season Seven
    • "Painless" - While not directly mentioned or referenced in this episode, Harris and Klebold appear to have been an inspiration for Randy Slade (and to a lesser extent, Lewis Ramsey) - All were school shooters, bombers, and mass murderers (only Ramsey wasn't a killer) who attacked the High School they attended, used both firearms and explosives, both Slade and Harris were diagnosed as psychopaths, attacked the cafeteria, both committed suicide and took ten lives in the process in the last and deadliest part of their massacres, they left dozens injured, both were narcissistic and referred to themselves as "gods", taunted their victims in some way, had brothers, and both inspired copycats who attempted to replicate their massacres.
  • Novels
    • Jump Cut - The duo was mentioned as an example of killing teams.