The Kootenai County Sheriff's Department says an eastern Washington teenager involved in a watercraft accident on Hayden Lake has died from his injuries.

In a statement Sunday, the sheriff's office says 18-year-old James Graham was operating a jet ski when he took a sharp turn and was struck by another watercraft driven by his 19-year-old brother, John.

Graham, of Spokane, Wash., was transported to Kootenai Medical Center in Coeur d'Alene where he was pronounced dead.

Authorities say they are still investigating and alcohol does not appear to be a factor in the accident.