Killer Siblings

Before "Killer Siblings" returns on Friday, December 3 at 8/7c on Oxygen, look back at the most horrific murders committed by family members.

Their lives had taken different paths, but a gruesome crime united the Luna brothers in murder.

Criminal behavior ran in the family for the Bruce brothers, who banded together for an execution-style double murder in Tennessee when they needed cash.

Missouri brothers Joe and Shannon Agofsky bragged about being well off — and those boasts helped investigators solve a bank heist and murder.

Orlando Romero and his younger brother Christopher Self are responsible for one of the most violent crime sprees in California history.

"Monster Preacher," "Framed By The Killer," "A Deadly Mistake," "Florida Man Murders," and more are coming to Oxygen in January for Nine Nights Of Twisted Killers. Here's how to watch.

Follow the money. That’s what investigators did in 1977 to nail Michael and Patrick Poland, two brothers behind an armored-car robbery and double murder.

Donald Young and his brother Timothy executed five people with shotguns in a California bar. An alleged accomplice claimed that the siblings followed that carnage with a triple homicide.

Two months after Regina DeFrancisco met Chicago truck driver Oscar Velazquez, she plotted his murder with her little sister, Margaret.

A hotshot Wisconsin district attorney went to extreme lengths to protect his own reputation — and was willing to manipulate his own brothers to commit a murder.