Gary Melillo, 52, killed, three 16-year-old teens seriously injured, taken to hospital, after their car collides with a motorcycle, driven by the deceased, on State Highway 2 in Commerce City.

The 52-year-old man killed when his motorcycle was hit by a carload of high school students was identified Tuesday afternoon.

The chief deputy coroner of Adams and Broomfield Counties identified him as Gary Melillo. He worked for Denver Public Schools as a facility manager at Martin Luther King, Jr. Early College.

The crash happened at around 3 p.m. Friday on the 7300 block of State Highway 2 in Commerce City. The crash closed the highway for nearly six hours.

Authorities suspect alcohol and speed were factors in the crash. They say a 16-year-old girl was driving a white Dodge Neon southbound on Highway 2 when she lost control and collided with a Yamaha motorcycle traveling northbound.

9NEWS has learned the driver of the Neon was driving without a license. She had a learner's permit.

Three of the 16-years-old teens, including the driver, were transported to Denver Health and were reported to be in serious condition as of last check Saturday.

A fourth passenger, an 18-year-old woman, was treated for minor injuries and released.

All four people in the Neon are students at Adams City High School, according to Commerce City Police.

A letter to parents from Martin Luther King, Jr. Early College was sent home with students Monday: