Convicted killer Scott Peterson was hurt in an incident involving another person at Mule Creek State Prison over the weekend, officials say.

Scott Peterson, convicted of murdering his pregnant wife and unborn son, was injured Sunday at a state prison during an “incident,” according to the California Department of Correction and Rehabilitation.

An inmate attacked wife killer Scott Peterson at a California state prison during a dispute over pickleball, according to TMZ. Sources told TMZ that the altercation happened Sunday in the yard near Peterson’s housing unit at Mule Creek State Prison,