LE MARS, Iowa (AP) — An Akron man charged in the death of his mother has pleaded guilty to second-degree murder and willful injury in a plea agreement with prosecutors. The Sioux City Journal reports 46-year-old Jonathan Neunaber entered his plea Monday in Plymouth County District Court. The plea deal calls for a 60-year prison sentence. Neunaber must serve at least 35 years before being eligible for parole.

He had previously been charged with first-degree murder in the beating death of his 80-year-old mother, Esther Neunaber. Her body and the body of her husband Donald Neunaber were found July 2014 in the home they shared with their son.

Donald Neunaber died of natural causes. Neunaber admitted in court Monday that he killed his mother with a steel pipe.