San Quentin Rehabilitation Center appears on Oct. 15, 2023. (Wendy Medina/Bay City News)

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.

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Dan McMenamin is the managing editor at Bay City News, directing daily news coverage of the 12-county greater Bay Area. He has worked for BCN since 2008 and has been managing editor since 2014 after previously serving as BCN’s San Francisco bureau reporter. A UC Davis graduate, he came to BCN after working for a newspaper and nonprofit in the Davis area. He handles staffing, including coaching of our interns, day-to-day coverage decisions and management of the newswire.