WHITEHALL TWP., Pa. -

Pennsylvania State Police continue to investigate the cause of the fatal accident that occurred Thursday night on Route 22 in Whitehall Township.

Thirty-four-year-old Nathan Warke of Allentown was killed in the crash, which happened about 8:20 p.m. in the westbound lanes at mile marker 322.3.

 Warke was pronounced dead at the scene.

An autopsy performed by the Lehigh County Coroner's office determined he died of multiple blunt force injuries.

According to police, Warke was driving his Jeep Wrangler west in the left lane of Route 22 when he was struck from behind by a truck, causing him to run into the back of a Freightliner tractor-trailer ahead of him.

The driver of the truck behind Warke was identified by police as Robert Kritzar, 41, of Hellertown. He has been charged with following too closely.

Kritzar received minor injuries, according to police, as did 25-year-old Joseph Jean, a passenger in his truck.

The tractor-trailer driver, identified as 62-year-old Frederick Ackerman of Orefield, also received minor injuries.

Anyone who witnessed the crash is asked to contact state police at the Bethlehem Barracks: 610-861-2026.