Juan Corona, convicted of killing 25 migrant workers in California some four decades ago, was again denied parole Monday.
The California Board of Parole Hearings turned down the seventh parole request of Corona, now 77 and diagnosed with dementia. He is not eligible for another parole hearing for five years, authorities said.
Corona is serving 25 concurrent terms of 25 years to life at Corcoran State Prison. First convicted in 1973, he won a new trial in 1978 and was re-convicted on all charges in 1982.
What at the time was the nation's worst serial murder case had its roots in the early 1950s, authorities said, when Corona moved to Yuba City, in Sutter County, where he worked as a migrant farmer. He soon established himself as a labor contractor.