UPDATE (9:30 p.m. Saturday)-- Dispatchers say a man found on fire alongside the highway has died.

Kent County deputies are still trying to contact the man's relatives.

It's unclear how he caught fire, but investigators do not suspect foul play.

PLAINFIELD TOWNSHIP, Mich. (WZZM)-- A Good Samaritan is being credited with fighting a fire that severely burned a man.

Kent County deputies were called to northbound U.S. 131 near the Post Drive exit around 3:45 p.m. Saturday, after a passerby spotted what looked like a grass fire.The Good Samaritan got a closer look, and saw that a man was actually on fire.

The Good Samaritan tried to put out the flames by throwing dirt on the man. The victim was taken to a nearby hospital with third degree burns over 100 percent of his body.

Deputies say the victim's vehicle was parked alongside the highway during the incident, but it's unclear how he caught fire.