70-year-old San Quentin prison inmate found slain in cell
On September 17, officials began investigating the death of 70-year-old Mark Squires at San Quentin prison, marking it as a homicide and prompting an inquiry into the circumstances.
He murdered two people. Then he was killed in a California prison
Michael Spengler, 38, died after being attacked by fellow inmate Miguel Espino, 31, at Salinas Valley State Prison, using an inmate-manufactured weapon.