Favored by schoolyard bullies for generations, the so-called 'atomic wedgie' has rarely, if ever, been listed as the probable cause of death in a murder investigation. But police in Oklahoma say that a 33-year-old man allegedly killed his stepfather after a fight last month by yanking the older man's underwear up his back and over his head so that the waistband was around his neck. Brad Davis, of McLoud, was arrested Tuesday and booked into the Pottawatomie County jail on a first-degree murder complaint for the death of his stepfather, Denver St. Clair.