Robert Hansen, a mild-mannered baker and accomplished hunter, confessed to killing 17 women and burying their bodies in remote wilderness graves.

In 1978, John Wayne Gacy, a well-respected businessman from Illinois, murdered more than 30 boys and young men.

Heriberto "Eddie" Seda was driven to kill after watching a PBS special about the original Zodiac Killer, who terrorized Northern California in the 1960s and '70s. 

Salvator Perrone was a mercantile middle-man who trademarked his own name for a clothing line before he carried out a series of shopkeeper murders.

Serial killer David Berkowitz wrote a letter to law enforcement claiming that “Father Sam” commanded him to “go out and kill.”

A devout Catholic, Paul Michael Stephani confessed to three slayings and two attempted murders after he was diagnosed with terminal cancer.

Rodney Alcala styled himself as a photographer and won the interest of a bachelorette on the show after describing himself as a "banana."

Serial killer Rodney Alcala, whose total victim count is unknown, posed as a fashion photographer to gain access to young women.

The only known survivor of the notorious serial killer Roger Kibbe, dubbed the I-5 Strangler for his spree on the California highway, speaks up about how she got away.

Warning: These photos are not for the faint of heart, and depict murderous violence against women.