Nathan Tubbs

Nathan Tubbs was a serial killer the BAU hunts in Flagstaff, AZ.

Background
Nathan Tubbs worked as a security Guard at a small, tight-knit university in Arizona. According to his profile, Nathan is Bi-Polar and suffers frequent manic episodes. It is apparent that there is a woman in his life that motivated his killings, probably by causing him some stress or frustration.

Season 3
While the BAU hunts for the serial killer, they meet Tubbs on several occasions; not initially realizing that he was the Unsub. Tubbs frequently sat alone in his apartment, drinking liquor and posing in front of the mirror, all while staring at news clippings of the murders.

It is revealed that during their recent divorce, Nathan's young daughter was taken away from him by his ex-wife. This event, and his ex-wife herself, seem to be the motivator in his killings. His victims are all brunettes, like his ex.

After the body of a student named Amy is found, Nathan goes cruising on the campus in uniform. He offers a young brunette student a ride, stating that she should not be walking alone at night. After having a disturbing conversation, Nathan gains the attention of nearby agents and police officers when the girl begins begging to be let out. Nathan is cuffed, and a knife is found on him.

During his questioning, Tubbs stares intently at Prentiss, who resembles his ex. Despite the agents' suspicions, they have no evidence against him, and he is released.

Later that night, Tubbs allegedly kills another student named Aliza, who was a friend of Amy's. It was noticed, however, that the knife wounds her not delivered in the same manner, as they seemed to be inflicted by a weaker person.

Another student named Anna, who is suicidal, tracks down Tubbs after dying her blonde hair brown. She lures Tubbs into a dark area, and begs him to kill her. He hesitates, and Anna stabs him. The agents show up and tell her to put the knife down. When she realizes that they will not shoot her, she turns the knife on herself.

Modus Operandi
Nathan kills his victims (brunette females) by stabbing them in the heart, then, after death, stabbing them repeatedly. He then poses them with their arms crossed.

Known Victims

 * Several unnamed female students
 * "Amy" - a student
 * "Aliza" - friend of Amy's who may have possibly been killed by Anna