Serial Killers

Jeremy Harris, who is accused in the murder last week of his ex-girlfriend’s father in Celina, Texas, is now connected to a trio of separate killings.

A licensed psychologist featured in Oxygen’s “Killer Siblings” separates fact from fiction regarding the MAOA gene mutation, sometimes referred to as the serial killer gene.

Joseph DeAngelo, who pleaded guilty in June to numerous rapes and murders in a deal that spared him the death penalty, has arrived at California's North Kern State Prison, where he'll spend the rest of his days behind bars.

Roy Charles Waller is accused of breaking into homes while wearing a ski mask to tie up and rape women.

The Golden State Killer is one of many who used Orange County, California as their hunting grounds.

Also included in the creepy collection are Gacy's prison letters to his stepdaughter, the last Polaroid he ever took, and the pack of cigarettes he had before his execution.

Joseph DeAngelo's daughter submitted a five-page letter to the Sacramento Superior Court in support of her serial killer dad, but made no reference to his crimes or many victims.

After Golden State Killer Joseph DeAngelo was sentenced, Patton Oswalt said he wouldn't give the "insect" any attention and instead offered his support for his wife Michelle McNamara, victims and investigators.

During his trial, the 74-year-old Joseph DeAngelo has often appeared wheelchair-bound and frail, but one prosecutor says that was simply a ruse.

Joseph DeAngelo will spend the rest of his life behind bars for murdering 13 people and raping nearly 50 women during the 1970s and '80s.