Officials have released the names of those involved in Friday's Fatality on Highway 33 near milepost 131 near Tetonia.
Madelene Quissek, 45, of Tetonia was traveling eastbound on Highway 33 in a 2007 Toyota Rav 4. Myrna Izaguirre, 43, of Burien, Washington, was traveling westbound in a 2015 Toyota Rav 4. Quissek and Izaguirre's vehicles struck each other head on.
Quissek and a juvenile passenger in her vehicle succumbed to their injuries on scene. A second juvenile passenger in Quissek's vehicle and Izaguirre were transported by ground ambulance to Madison Memorial Hospital.
All occupants were wearing seat belts. ISP was assisted at the scene by the Teton County Sheriff's Office, Teton County Fire Department, and the Idaho Transportation Department.
The crash is under investigation by the Idaho State Police.