This post has been updated.
Authorities said the victim had suffered trauma to his upper body that was unrelated to the impact of the car, police said. The man was identified Saturday as Zavier O. Stringfellow, who lived just off I-66 between Gainesville and Manassas.
Fairfax County police said Stringfellow’s body was found Friday about 7 p.m. inside a minivan at the end of a service road near Chain Bridge Road and Glengyle Drive.
Police said Stringfellow was pronounced dead at the scene.
A department spokeswoman, Lucy H. Caldwell, said an autopsy performed Saturday confirmed the cause of death. No other information was made available.
Anyone with information is urged to contact Crime Solvers at 1-866-411-TIPS (8477). People can also e-mail from the crime solvers web site or text “TIP187.”