The victim, 77-year-old James Elijah Ellis of Henderson, was crossing the street in front of Time Out when he was hit by a white BMW 5-series sedan.
Police would not comment on the identity of the driver.
Chapel Hill police reported that Ellis was transported by ambulance to UNC Hospitals, where hospital staff say he was pronounced dead about 10:10 p.m.
Orange County medical examiner Jason Reutter, who performed the autopsy Wednesday, said the cause of death was blunt force head trauma.
"Basically what he has is a laceration in his scalp," he said. "It's not where the car hit him but where he hit the ground."
Reutter said it is difficult to tell if Ellis crossed the street, walked out into the street and tried to walk back to the sidewalk or simply stumbled into the road.
There were no other points of impact other than the head that contributed to Ellis' death, Reutter said.
He added that Ellis had a heart condition but that there was no connection between the accident and the heart condition.
The BMW could have been traveling at as little as 10 mph, Reutter said, but the exact speed of the vehicle has not yet been verified by police.