A man involved in a one-car accident Friday died of natural causes, according to the Northampton County coroner.

The accident happened around 7 a.m. as 70-year-old Charles Canfield was driving south in the 900 block of Morgan Hill Road in Williams Twp.

Canfield crossed over the center line and hit a guardrail on the opposite side of the road, police said.

According to Northampton County coroner Zach Lysek, Canfield died of 'natural disease process in his car.'

Canfield was from East Stroudsburg, Monroe Co.