
An incarcerated person at San Quentin Rehabilitation Center died Tuesday in a case authorities are investigating as a homicide, according to the California Department of Corrections and Rehabilitation.
Mark Squires, a 70-year-old man, was found unresponsive at about 3:30 p.m. Tuesday in the cell he was occupying with 36-year-old Gustavo Lopez.
Squires was taken to a triage and treatment area but was pronounced dead at 4:04 p.m., while Lopez was placed in restricted housing at the prison pending investigation by CDCR officials and the Marin County District Attorney’s Office.

Squires came to San Quentin in 2000 on a life sentence from Riverside County for lewd or lascivious acts with a child under 14 with force or violence. Gustavo also came from Riverside County, arriving in 2020 on a sentence of more than 13 years in prison for kidnapping, false imprisonment and other charges, according to the CDCR.
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