It was a multiple episode story arc. The serial killer was Gormagon. I can't say for sure when it started but it culminated in the Season 3 Finale "The Pain in The Heart". One of the most controversial and shocking episodes of Bones (Fans Wise) to date. Enjoy.
NO he wasn't the killer in Bones, but he was in the episode. The little sister in the pageant turned out to be the one who killed her, but it was basically by accident.
Zack Addy goes to jail in the "Bones" episode titled "The Pain in the Heart," which is the 15th episode of Season 3. In this episode, he is revealed to have been involved in the actions of the Gormogon serial killer, leading to his arrest. This marks a significant turning point for his character in the series.
The episode is called The Parts in the Sum of the Whole.It was the 100th episode of Bones and was the 16th episode in the 5th season.
This occurs in Season 3 of bones, Episode 8, The Knight on the Grid
Harvey.
Season 5 Episode 1 'Harbingers in the Fountain' after Bones got stabbed in the arm by the doctor.
Bones, season 5, episode 10, "The Goop on the Girl". It was a Christmas special episode December 10, 2009.
Here:http://www.watchbonesonline.us/bones-season-1-episode-15
Bones - 2005 The Killer in the Crosshairs 6-15 is rated/received certificates of: Netherlands:12
Bones - 2005 The Killer in the Concrete 2-18 is rated/received certificates of: USA:TV-14
Bones - 2005 The Ghost in the Killer 9-12 is rated/received certificates of: USA:TV-14
There is no such episode by that name.