They say the crash happened at 10: 20 a.m. when a Kenworth T800 was traveling south on Route 255 (Million Dollar Highway) at the intersection with Laurel Lane when, for unknown reasons, it left its lane and went into the path of another Kenworth truck.
The driver of the first truck was flown to UPMC Mercy in Pittsburgh. The driver of the second truck was pronounced dead at the scene by the Elk County Coroner.
Police are continuing their investigation.
They were assisted by Fox Township Fire and EMS, St. Marys fire and EMS personnel, the Elk County Hazmat Unit and PennDOT.
Route 255 between Kersey and Old Kersey Road will be closed for several more hours so emergency crews can continue conducting an accident investigation. Motorists are asked to use alternate routes if they must travel that way.