SHAWNEE, Okla. — An Oklahoma man has admitted to giving his stepfather a fatal wedgie that strangled the man.

The Oklahoman reported that 34-year-old Brad Davis pleaded guilty Monday to first-degree manslaughter in the December 2013 death of 58-year-old Denver St. Clair. A doctor who did the autopsy report said St. Clair died when the elastic band of his torn underwear was pulled over his head and pressed against his neck, cutting off his air.

Davis said St. Clair insulted his mother and that the men fought before the death.

Prosecutors agreed to reduce a first-degree murder charge to manslaughter in exchange for the plea. They seek a 35-year prison sentence.

A district judge is scheduled to decide a punishment for Davis in July.