Title: Jason Gideon
Content:  he would know when he had reached it. He then leaves the diner and drives off, as his voiceover off-screen narrates the final lines of his letter: "I guess I'm just looking for it again. For the belief I had back in college. The belief I had when I first met Sarah and it all seemed so right. The belief in happy endings." In the Season 10 episode "Nelson's Sparrow," Gideon is murdered off-screen, having been shot dead at a close range by a serial killer named Donnie Mallick. During the flashbacks focusing on a young version of him for the episode, which show him working at the BAU in 1978, he is played by Ben Savage.
Title: Jason Gideon
Content:  Gideon began to lose confidence in his profiling skills after Sarah's murder. During his final case in Arizona ("Doubt," season 3), he further loses faith in his abilities when his decision to release a suspect resulted in the deaths of both the suspect and a young woman. As a result of Gideon's actions, Hotchner is suspended, which is the final straw for Gideon. At the end of the following episode, "In Name and Blood," Reid visits Gideon's cabin but finds only his gun and badge, along with a letter meant for him. Gideon is last seen entering a Nevada diner; asked by a waitress where he is going, he replies that he does not know his destination or 
Title: List of Criminal Minds characters
Content:  both the unsub and a young woman. As a result of his actions, Aaron Hotchner was suspended, which was the final straw for Gideon. He then left his cabin shortly afterwards, leaving his gun and badge behind along with a letter for Reid to find as he sought to regain a belief in happy endings. In the season ten episode "Nelson's Sparrow", Gideon was murdered off-screen, having been shot dead at a close range by a serial killer named Donnie Mallick (Arye Gross), which prompts the BAU team to investigate Gideon's murder. During the flashbacks focusing on a young version of him for the episode which show him working at the BAU in 1978, he is played by Ben Savage.
Title: Jason Gideon
Content:  Jason Gideon is a fictional character in the CBS crime drama Criminal Minds, portrayed by Mandy Patinkin. Gideon is a Senior Supervisory Special Agent and the unit chief of the FBI's Behavioral Analysis Unit, and appeared from the series' pilot episode "Extreme Aggressor," which was originally broadcast on September 22, 2005, until "In Name and Blood," the second episode of the third season. He is also portrayed as a younger man by Ben Savage in flashbacks. Mandy Patinkin abruptly left the show in 2007, just as his character abruptly quit from the BAU, due to emotional distress. In 2012, Patinkin opened up about why he left stating that the show "was very destructive to my soul and my personality. After that, I didn't think I would get to work in television again." Immediately after Gideon's departure, Aaron Hotchner (Thomas Gibson) is appointed unit chief. When Hotchner also leaves the BAU, the position is given to Emily Prentiss (Paget Brewster), then temporarily to Jennifer Jareau (A.J. Cook), until Prentiss again becomes chief and remains so for the duration of the series. In season ten, Gideon is murdered off-screen by serial killer Donnie Mallick (Arye Gross).
Title: Criminal Minds (season 15)
Content: Ben Savage as Young Jason Gideon 
Title: List of Criminal Minds characters
Content:  exception being Reid's birthday) and encouraging him to "think outside the box". Prior to the series, he was said to have had a "nervous breakdown" (or "major depressive episode") after he sent six men into a warehouse with a bomb in it; all six agents were killed, and he was heavily criticized about the event. He showed particular dislike for the practice of using religion as a defense or motivation for one's crimes. Gideon participated in some field operations during his time with the BAU and had the rest of his team "think outside the box" as well, as he made a major advancement by shouting at the top of his lungs with pleas of mercy and, when questioned by his 
Title: Frederick Chilton
Content:  He first appears in the episode "Entrée", in which his patient Dr. Abel Gideon (Eddie Izzard) kills a nurse after Chilton unwittingly influences him into believing that he is the serial killer known as the Chesapeake Ripper. Gideon eventually learns the truth and suffers an identity crisis, and he escapes to seek revenge against all of his previous psychiatrists, including Chilton. Gideon kidnaps and tortures Chilton, intending to leave his organs as a "gift basket" for the real Ripper. Gideon is forced to flee from the police after having removed some of Chilton's less vital organs, leaving him alive but in critical condition.
Title: Criminal Minds (season 5)
Content: David Eigenberg as FBI Special Agent Russell Goldman (Episode 14) 
Title: Gideon's Day (film)
Content:  young constable for running a red light. Once at his office, he calls in the detective whom a "snout" [i.e. informant] has told him is taking bribes and suspends him. Gideon then gets word that an escaped mental patient from Manchester is on his way to London. Meanwhile, an audacious gang is robbing payrolls. The mental patient is soon arrested, but not before he has killed the daughter of his former landlady. Gideon wants to congratulate personally the policeman who made the arrest, only to discover it is the same young officer who gave him a summons for his early morning traffic offence. Various jobs then preoccupy the 
Title: List of Criminal Minds characters
Content:  he said that the victims were being threatened to be kept quiet as neighbors would have heard the pleas if they were unrestrained. He blamed himself for the torture Reid received from Tobias Hankel as he had ordered Penelope Garcia to add a virus warning to the videos Hankel posted. Gideon also had a son named Stephen. The nature of their relationship has not been directly stated, but it was implied that they have not seen each other very recently. Gideon began to lose confidence in his profiling skills after Frank Breitkopf murdered his girlfriend, Sarah Jacobs. During his final case in Arizona, he further lost faith in his abilities when his decision to release the unsub resulted in the deaths 

Question: which episode does gideon die in criminal minds?
Answer: "Nelson's Sparrow".
Nelson's Sparrow.