Zebra murders

The "Zebra" murders were a string of racially motivated murders and related attacks committed by a group of four black serial killers in San Francisco, California, United States, from October 1973 to April 1974; they killed at least 15 white people and wounded eight others. Police gave the case the name "Zebra" after the special police radio band they assigned to the investigation.

Some authorities believe that the Death Angels, as the perpetrators called themselves, may have killed as many as 73 or more victims since 1970. Criminology professor Anthony Walsh wrote in a 2005 article that the "San Francisco–based Death Angels may have killed more people in the early- to mid-1970s than all the other serial killers operating during that period combined."

In 1974, a worker at the warehouse where the Death Angels were based testified to police for a reward, providing private details about the murders. Based on his evidence, four men were arrested in connection with the case. They were convicted in a jury trial of first-degree murder and conspiracy charges, and sentenced to life imprisonment. The informant received immunity from prosecution for his testimony, and he, along with his family, was admitted to a witness protection program.