For years, the death of 15-year-old Danni Houchins had been shrouded in mystery. Investigators initially said it could have been a tragic accident, but her family always suspected something more sinister. 48 HOURS and correspondent Peter Van Sant report on the case in "It's About Danni,"

Investigators suspected that oil on the road had come from the vehicle that struck McClendon. Following the oil trail, the sheriff's deputies were led to the home where Ackerman lived. Ackerman had spent the day with his three children, but investigators quickly noticed red flags, including his Ford pickup, which was leaking oil in the driveway. Its front grille was broken, and a palm print was visible on the hood.