A Harrison man is dead following a car accident in Mecosta County Tuesday.

It happened on southbound US-131 just south of 8 Mile Rd.

According to a witness, a tractor trailer driven by 55-year old David Kolp left the road and drove into the trees.

When State Police arrived to the scene, Kolp was found unresponsive. He was taken to Spectrum Health Hospital in Big Rapids where he later died.

The cause of the crash is unknown at this time, however investigators believe Kolp may have experienced a medical emergency which led to the crash.

The investigation is ongoing.