Investigators say they've solved the 1984 bludgeoning deaths of a mother, her son and her son's fiancee in southern Iowa.
The Iowa Division of Criminal Investigation and officials from two sheriff's offices will announce the resolution to the case Friday.
Davis County Sheriff Dave Davis confirmed Thursday the developments come in the deaths of 20-year-old Justin Hook, Jr.; his mother, 41-year-old Sarah Link, and Hook's fiancee, 19-year-old Tina Lade.
Firefighters found Hook's body outside his burned-out mobile home in rural Drakesville in April 1984. A farmer found Link's body the following week in a wooded area near Eldon. Two days later, police dogs discovered Lade's body in a ravine a half-mile away.
All three were killed by trauma to the head.
No one has been arrested in the case.