Juan Vallejo Corona was a Mexican serial killer who was convicted of the murders of 25 migrant farmworkers found buried in shallow graves in peach orchards along the Feather River in Sutter County, California, United States in 1971. At the time, the crimes were characterized as among the most notorious in the United States' history. Until the discovery of Dean Corll's victims two years after his own conviction, Corona was the deadliest American serial killer by the number of proven victims.