Court papers show Davis admitting to pulling Denver St. Clair's underwear over his back and head allowing the elastic band to wrap around his neck.
Davis dialed 9-1-1 to report his crime after St. Clair stopped breathing. Officials say he told detectives he gave his stepfather an atomic wedgie.
Davis told police a fight started after his stepfather insulted his mother. Police say the fight turned violent with blood spatter on the walls and underwear over the victim's head. Court papers also show Davis planned on assaulting his stepfather but not necessarily killing him.
Davis is being held without bond. A formal charge is expected to be filed at a court hearing later this month.
