A man who died Sunday after his car left the road north of Hailey may have had a lethal medical emergency before losing control of his car and crashing through a fence.

Jeffrey C. “Jeff” Browne, 50, of Hailey, was southbound on state Highway 75 when the single-car accident occurred, the Blaine County Sheriff’s Office reported Monday.

Browne was traveling southbound by himself when his Jeep Grand Cherokee veered off the road and crashed at Cottonwood Creek Circle and came to rest in some bushes. The vehicle suffered “substantial” damage, according to the sheriff, and Browne was not wearing a seatbelt.

Police responded just past 5:40 p.m. to the engine running and Browne unresponsive behind the wheel. Deputies performed first aid until Wood River Fire & Rescue took over treatment, ultimately transferring Browne by ambulance to St. Luke’s Wood River Medical Center. Browne was pronounced dead at the hospital.

The Sheriff’s Office reported Wednesday that injuries resulting from the accident, as observed at the hospital, did not appear to be life-ceasing.

A toxicology report by the Blaine County deputy coroner showed no signs of intoxication. No autopsy was conducted.

The Sheriff’s Office reported Thursday that information supplied by the Blaine County Coroner’s Office showed that Browne’s medical history indicated that a medical emergency may have caused Browne to lose control of the automobile.

An investigation is still underway as to the cause of death.

Email the writer: tevans@mtexpress.com