A second inmate has died after last week's attack at a California State Prison, officials tell CBS affiliate KBAK.

The attack happened at the state's drug abuse treatment facility and prison in Corcoran, about an hour south of Fresno.

Inmate Jonathan Watson, 41, is accused of attacking two inmates with a weapon. An ambulance was called and both were taken away.

Inmate David Bobb, a 48-year-old convicted child molester, died while on the way to the hospital, officials said. Since 2005 he was serving life with the possibility of parole for aggravated sexual assault of a child under 14 years old.

Inmate 62-year-old Graham De Luis-Conti died a few days later. Conti was in the prison since 2001. He also was sentenced to life with the possibility of parole for aggravated sexual assault of a child under 14 years old, according to KBAK.

The attacker, Watson, has been in the prison since 2009. He's serving life with the possibility of parole for first-degree murder.

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