In the bizarre case of a death caused by an “atomic wedgie,” a McLoud man pleaded guilty Monday to first-degree manslaughter.

Brad Lee Davis, 34, admitted he killed his stepfather on Dec. 21, 2013, “in the heat of passion while defending myself in a fight that got out of hand and went too far.”

The victim, Denver Lee St. Clair, 58, died when the elastic band of his torn, blue underwear was pulled over his head and ended up tightly against the front of his neck, cutting off his air, the doctor who did the autopsy reported.

St. Clair also had been beaten around the head, the doctor reported.