CLARKSTON, Wash. – The Washington State Patrol Cold Case Unit and the Clarkston Police Department are working together to investigate a 1990 unsolved homicide.

Toni Ann Tedder,18, died from a knife wound on July 28, 1990 while sleeping on the couch at her home on the 500 block of 7th Street. Officials said there were other people in the home at the time.

Detectives believe a wooden handled fishing fillet knife with a 6-inch blade, that was found at the scene, is the murder weapon. They have conducted numerous interviews have been conducted over the years and leads followed but no arrests have been made.

Anyone with information that could help the investigation is urged to call the Clarkston Police Department at 509-758-1680, WSP Detective Sgt. Stacy Moate at or CPD Detective Sgt. Bryon Denny at