Authorities say an off-duty police officer died following a head-on crash with an ambulance in West Jefferson. The State Highway Patrol says 53-year-old Marcia Frederick of the Columbus Police Department died at the scene. Troopers were called to the crash on state Route 142 shortly before 2:30 yesterday afternoon. They say Frederick's southbound SUV had traveled left of the center line, striking a northbound Jefferson Township Medic Squad vehicle. The two medics in the ambulance were injured and taken to a hospital. Two people inside the ambulance who were being transported for treatment were also taken to a hospital. Authorities continue to investigate the crash.