SAN QUENTIN, Calif. — Death row inmate Phillip Jablonski, 73, died after being found unresponsive inside his cell at San Quentin State Prison, according to the California Department of Corrections.

The CDCR reported Jablonski was found unresponsive in his cell around 1:10 p.m. on Friday. Officials said he was pronounced dead about 20 minutes later. His cause of death is pending an autopsy.

Jablonski was sentenced to death row on Aug. 12, 1994 for the first-degree murders of his mother-in-law, Eva Petersen, 72, and his wife, Carol Spadoni, 46, who had married him while he was in prison for murdering a previous wife in 1978.