This Serial Killer Possessed The Highest IQ

Charlene and Gerald Gallego claimed the lives of 10 people and an unborn child from 1978 to 1980 in a reign of terror that was dubbed the "sex slave murders," writes SFGate. Nine of the 10 victims were young women, and Charlene would lure the girls from malls to a van where Gerald would be waiting. Once the victims were in the vehicle, Gerald would reportedly brandish a gun and would sexually assault them. The victims, half of whom were teenagers, were then killed.

Though Charlene and Gerald were both tried for their crimes, Charlene managed to convince the prosecution that she was coerced into taking part in the killings and was offered a plea deal for testimony against Gerald. She was sentenced to 16 years in prison and has since been released. "I would've done anything I could if I could've stopped him. I know I couldn't have stopped him; I tried to stop him," Charlene said in an interview with CBS Sacramento after her release. However, many are unconvinced of Charlene's protests of innocence, including her own former partner-in-crime.

"The only thing you know is what Charlene Gallego told you, and the only thing she told you is what she wanted you to know," Gerald Gallego said during his trial, as related in R. Barri Flowers' book The Sex Slave Murders.

"She was just as guilty as he was," added Hal Sowers, whose only daughter was one of the Gallegos' victims.