Jonathan Watson, 41, used a walking cane to cause multiple head wounds to two fellow inmates at the California Substance Abuse Treatment Facility and State Prison in Corcoran, officials said. (California Department of Corrections and Rehabilitation)
CORCORAN, Calif. - A second convicted child molester has died after he was beaten with a walking cane by another inmate last week at a central California prison, officials said Wednesday.
Graham De Luis-Conti, 62, was pronounced dead on Sunday at a hospital, three days after authorities said he was attacked at California Substance Abuse Treatment Facility and State Prison in the small central city of Corcoran, corrections officials said in a statement.
They said Jonathan Watson, 41, used the cane to beat the heads of both inmates. David Bobb, 48, died en route to the hospital.
Both victims were serving life prison sentences for aggravated sexual assault of a child under 14 years old.
Related: Inmate kills convicted child molester in California prison attack, officials say
Watson has served 10 years of a life sentence for first-degree murder and discharging a firearm causing great bodily injury or death.
The California Department of Corrections and Rehabilitation is investigating the motive for the attack, said spokeswoman Terri Hardy.
A 2015 analysis by the Associated Press found that male sex offenders were being killed at a rate double their percentage in California’s prison population, often because they are targeted by other inmates for their crimes against children.
The prison houses more than 5,400 inmates and specializes in substance abuse treatment.
The Associated Press contributed to this report.