State police are investigating a fatal crash on Route 15 southbound, south of exit 40 in Norwalk.
Police responded to a crash with a possible fire on the Merritt Parkway South just before exit 40B at 12:15 a.m. and found a 7 series BMW down an embankment, according to the fire department.
A state trooper had extinguished the fire before firefighters arrived.
Paramedics from Norwalk Hospital pronounced the man, who was alone in the car, dead.
Police closed Creeping Hemlock Drive while emergency personnel were at the scene.
The scene was cleared at 4:16 a.m.
Police have not yet released the man's name.