Plot Synopsis

Using exclusive interviews and firsthand accounts, each one-hour episode of KILLER SIBLINGS explores the psychology and pasts of cold-blooded siblings who have carried out vicious murders. From teen brothers with a perverse dream to become prolific mass murderers, to a Sheriff's deputy who killed his wife's lover by employing his brothers, who were on the FBI's most wanted list, to do his dirty work, this series tells the twisted stories of some of the most maniacal siblings in history. In the series opener, "Gustafasons,' their brother is convicted of murder, and three siblings hatch a deadly plot to avenge him by targeting the star witness in his trial. The plan goes awry when the wrong person is on the receiving end of their vengeance.

The sophomore season of KILLER SIBLINGS premiered on Saturday, November 7, 2020 at 6pm ET/PT on Oxygen. In the season opener, "Hawes," a missing persons case spirals down a winding path once detectives learn that a formerly beloved older brother appears to have embezzled money from the family's business; his siblings are hellbent on getting revenge.
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KILLER SIBLINGS returned for its third season on Friday, December 3, 2021 at 8pm ET/PT on Oxygen. In the season opener, "Kauffman and McMahan," tragedy strikes rural Iowa as two women are found murdered in their homes. When a local bank is robbed the same day, investigators connect the crimes to an unfolding crime spree and race to find the killer siblings before they can strike again.