Responding Sunday night to a report of a solo vehicle traffic collision in the Oxbow District, Napa Police reported finding an unconscious man lying on McKinstry Street near a convertible sedan.
The man, who had sustained major injuries, was taken to an area hospital where he was pronounced dead, police said. He was identified by the Napa County coroner's office as Jacob Patrick Paine, 19, of Sonoma.
Investigators are trying to determine a fuller picture of how the fatality occurred, Police Lt. Brian Campagna said Monday.
Paine had been in a vehicle with five other people prior to the incident, which occurred just before 11 p.m., Campagna said. Whether he was on or in the vehicle is being investigated, he said.
All the involved parties, who are from Napa and Sonoma, were cooperative and interviewed, police said.
Police said they called out the department's Accident Reconstruction Team and investigations unit to look into the circumstances of the incident and whether drugs or alcohol played a role.
McKinstry Street was closed between First Street and the Westin Verasa hotel for four hours while investigators processed the scene.
Anyone with information is asked to contact Traffic Officer Aaron Medina at 707-257-9223 or firstname.lastname@example.org.
An anonymous tip can be texted to the Napa Police Department by texting the word 707NPD and the tip information to 847411 (tip411).