such as an electric blanket. >> a fractured rib alerted the medical examiner to a bullet pathway that led from david's left side through his heart. cause of death was a single gunshot. >> it was a small-caliber handgun. they couldn't determine, you know, what caliber, because we never found the bullet. >> to investigators, it seemed strange that david's ex-wife reported him missing just three hours before his body was found. and police soon learned she had a possible motive, a $500,000 motive. [ male announcer ] are you so stuffed up, you feel like you're underwater?