This list covers all minor criminals mentioned in Season Five.
Reckoner
Dan Patton
Killed Emma Louise Schuller in a drunk driving accident. Later beaten with a baseball bat and killed by hitman Tony Mecacci at the instruction of Emma's widower, retired district court judge Boyd Schuller.
Rita Haslat
A neglectful social worker killed by Tony at the instruction of Schuller, the judge presiding over her trial. As one case involved a child who starved to death, she was abducted and starved for four weeks before being murdered.
Bill Levington
A serial child rapist killed by Tony at the instruction of Schuller, the judge presiding over his trial. Was castrated postmortem as punishment after being murdered.
Ben Vanderwaal
Sexually abused his stepdaughter. Killed by Tony at the instruction of Schuller, the judge presiding over his trial. Was tied to a chair and killed, his hands cut of postmortem as punishment.
Sean
An enforcer for gangster Ray Finnegan. Ray's old friend Rossi made a deal with Ray that Sean would only be incarcerated for two years for trafficking weapons if he helped lure Tony Mecacci to his bar. After Ray is killed by Tony, Sean tracked him down and killed him as revenge.
Hopeless
DuPont Circle rioters
An unspecified number of people, estimated in the dozens, who started a riot in DuPont Circle, being spurred on by a string of brutal murders. When police arrived to break up the riot, the participants responded violently, resulting in the injury of a few officers and the arrests of several rioters.
Cradle to Grave
The white supremacist
While working late and looking over cases sent to them, JJ and Hotch discuss one involving an apparent white supremacist group operating in Baton Rouge. The two dismiss the group as nonexistent, due to the inconsistency of the letters sent by it (they continually switch between "I" and "we") and conclude they were written by a racist working alone.
Unnamed accomplice
A young man who was hired by Robert Reimann to help abduct a woman named Julie. After leading Julie to a secluded stop, Robert suffocated her into unconsciousness and paid the man. It is unknown if the man was caught after Robert's incarceration.
Outfoxed
Garrett Pain
Garrett Pain
An apparent psychotic, Garrett Pain was a serial killer who, according to Prentiss, "tore apart" fourteen women. She and Hotch briefly spot him (pressing up against the glass of his cell, and making barking sounds) when they visit Karl Arnold at the prison where they were both incarcerated. Casting calls for the episode reveal he was a cannibal.
Retaliation
Dan Otey
A bank robber who, at some point in 1998, sold out future spree killer Dale Schrader, leading to his temporary incarceration. Eleven years later, in Retaliation, he became the final victim of Dale's killing spree when he lashed out against those responsible for his imprisonment.
Crack house accomplices
A group of drug addicts living in a crack house, whom Dale Schrader paid to keep an eye on a family he had abducted. At the end of the episode, the addicts were arrested and the captive family was rescued. It is presumed at least one of the addicts are pedophiles or otherwise a sex offender, as the youngest son in the family was found half-naked while wandering around the abandoned property, to the shock of the federal agents and local police.
Stacy Ryan
The sister of a former cellmate of Dale Schrader, she was a crack addict who frequented a crack house with others who were paid by Schrader to keep the wife and daughter of Joe Muller (who he had abducted as vengeance for Muller working as an undercover detective who outed him). When Ryan objected to Schrader's plan, he stabbed her to death and dumped her body off a roadside. Her connection to Schrader was later deduced by the BAU and they rescued Muller's family.
Mosley Lane
Jake Wusman's abductor
One or more offenders who abducted Jake Wusman from Rock Creek Park on September 29, 2000 while he was there on a picnic with his entire family. He was never found, alive or dead. His case was one of those archived by Sarah Hillridge during her search for her abducted son Charlie, and he was briefly suspected to have been one of the victims of the Roycewoods.
Solitary Man
The trucker
An unseen trucker who appears at the end of the episode, driving a truck similar to that of the unsub's. He or she picks up a hitchhiker from the streets. Because of the ominous music playing during the scene, plus the fact that it follows a scene in which the BAU discuss about other highway serial killers (like the unsub) who have yet to be caught, it is implied that the trucker intends to kill the hitchhiker or commit some other criminal act upon her.
The Fight
Child killers
A case Hotch and Cooper worked on in an unspecified location. Five children were found murdered, and with the BAU's help, the local authorities were able to arrest a suspect, who confessed to all the murders. However, regardless of the killer's confession, Hotch and Cooper felt that he did not kill all the children, due to the victimology being too varied. Despite the agents' doubts, the police and FBI considered the case closed, and the two were sent back to Quantico. Hotch and Cooper's belief that there was a second unsub was ultimately proven correct when the other killer was captured shortly after dumping the body of another boy.
A Rite of Passage
The Dragon
A murder case Sheriff Eva Ruiz worked in New York, prior to her career in Texas. The parents of a little girl were murdered by a man in a green hooded shirt. When the daughter, who witnessed it, told the police what happened, she said a "dragon" had killed her parents because that is what the killer looked like in the hood. It is unspecified whether he/she was caught.
An unnamed coyote
A Hispanic coyote who lured in a family of illegal immigrants fleeing from Ronald Boyd and imprisoned them in his house. He also separated the mother from the others and raped her. He was arrested by Morgan and Prentiss after the immigrants were traced to his house and Hotch later pulled some strings to prevent him from being deported so he could remain in the US to be charged.
...A Thousand Words
Morris Monroe
The father of Juliet Monroe, Morris was a serial rapist whose favorite victim was his own daughter. His repeated raping her turned her into a hybristophile, someone who is attracted to people who commit violent acts. Despite the abuse she suffered at his hands, she would regularly visit him in prison a few times a year. His status in "...A Thousand Words" is unspecified, but given his crimes, he was most likely still in jail or deceased.
Exit Wounds
Owen Porter's unnamed father
The father of serial-turned-spree killer Owen Porter, he violently abused his wife and son, who always covered for him whenever the authorities got involved. When Owen started killing, he and his wife covered for him. Owen and his father were later arrested, the former for his killings and the latter presumably for covering for his son and possibly for abusing him. It's safe to presume he is incarcerated for his crimes. It's unknown if his wife was ever charged for her role in the cover-ups.
The Internet Is Forever
Scott Weldon
One of three Boise, Idaho locals who were arrested for viewing a series of snuff films, which is considered a serious felony.
David Caston
Another one of three Boise, Idaho locals who were arrested for viewing a series of snuff films, which is considered a serious felony. During his interrogation, he informed Prentiss of the poster's upcoming murder, which later turned out to be unsuccessful.
Our Darkest Hour
Unnamed burglar
A man in Westchester, California, who broke into a house on October 8, 2009, by kicking in the front door. After violently kicking the dog when it barked at him, he fled with the television before officers could respond. The perpetrator was described as a white male aged 25-40 on Garcia's screen. There have been no suspects in the case, which remains open. Garcia tracked the case down while searching for possible home invasions with a similar M.O. to the current case.