The Palm Beach County Sheriff's Office says a driver died Monday morning after veering off Lantana Road near Brentbook Boulevard in suburban Lake Worth.
Traffic investigators are unclear what caused 60-year-old Peter Newman of Royal Palm Beach to lose control of his Toyota Tacoma.
They say he was heading west shortly before 9 when his vehicle crossed the median, mounted the southern shoulder of the roadway and crashed into a landscaped area.
An off-duty firefighter stopped and performed CPR before Palm Beach County Fire Rescue took Newman to Delray Medical Center where he was pronounced dead, PBSO said.
Investigators said based on the minimal damage to the Tacoma they suspect Newman suffered from a medical emergency which caused him to lose control.