MOUNT SINAI - Police say a teen died after crashing a Lamborghini in Mount Sinai early Friday morning.

Samuel Shepard, 18, was driving the 2010 sports car northbound on County Road 83 when he lost control of the vehicle and struck a guardrail near Route 25A at 2:25 a.m.

Shepard was taken to Stony Brook University Hospital, where he was pronounced dead.

The passenger and owner of the vehicle, Michael Power, 49, of Port Jefferson Station, was also taken to Stony Brook University Hospital with injuries that are not considered life-threatening.

Police say Shepard met up with Power, a family friend, to go for a ride. They were on the road for about 5 minutes before the crash happened.

Relatives say Shepard was a 2014 high school graduate and was heading off to boot camp in October. He had hoped to join the Army Special Forces.

Following a preliminary investigation, detectives have determined that excessive speed was an apparent factor in the crash. Drugs and alcohol were not involved, according to investigators.

Police say Shepard was not wearing a seat belt when the crash happened, although Power was belted in.