Monroe County Sheriff's Deputies say a car hit a speed limit sign and mailboxes before slamming into a tree on East Street, near Thornell Road in Pittsford.
A passenger in the car, 20-year-old Joel Ajavon of Pittsford, was killed.
Deputies say the driver, 20-year-old Michael Weber of Pittsford, suffered serious injuries.
Deputies say Weber appeared to be under the influence of alcohol at the time of the crash around 2:30 Monday morning.
People who live in the neighborhood heard the crash and called 911.
Charges are pending.