SAN FRANCISCO (KRON) — California prison inmate Scott Peterson was injured at Mule Creek State Prison on Sunday, prison officials said.

The convicted murderer was involved in an “incident with another person” and suffered “minor injuries” on March 9, a California Department of Corrections and Rehabilitation spokesperson told affiliate KRON.

Peterson, 52, continues to be incarcerated in Mule Creek State Prison, the CDCR spokesperson said.

The infamous inmate allegedly got into a heated confrontation with another inmate while he was playing pickleball in the yard, TMZ reported. The confrontation turned into a physical fight.

A San Mateo County jury convicted Peterson two decades ago of murdering his pregnant wife, Laci, and their unborn son, Conner. Laci was murdered in Modesto on December 24, 2002. Prosecutors said Peterson dumped Laci’s body from his fishing boat into the San Francisco Bay.

Peterson has never admitted to killing his wife. He is currently represented by Los Angeles Innocence Project attorneys who say mishandled or overlooked evidence could possibly exonerate him.

Peterson is serving a life prison sentence without possibility of parole.