A Superior Court judge sent a Dorchester man to state prison on Tuesday after he admitted to driving drunk during a crash in the neighborhood that killed a teen cyclist, officials said.

Gregory McCoy, 28, was sentenced to 8 to 12 years after pleading guilty to manslaughter while operating under the influence, leaving the scene of a collision causing death, and leaving the scene of a collision causing injury, District Attorney Daniel F. Conley’s office said in a statement.

McCoy’s public defender could not be reached for comment.

According to prosecutors, McCoy was driving his friend’s 2012 Cadillac CTS at a high rate of speed on the night of May 19, 2015, when he rear-ended a BMW stopped at a red light at the intersection of Norwell Street and Talbot Avenue.

The impact sent both vehicles “careening through the intersection,’’ and Fritz Philogene, 18, of Dorchester, was fatally struck as he waited at the corner on his bicycle, the statement said.

Conley’s office said McCoy freed himself from the damaged Cadillac and fled on foot.

Boston police detectives found him at his Wentworth Street home, and he was taken to Carney Hospital, where testing the next morning showed his blood-alcohol level was above the legal limit of .08 during the crash, the statement said.

The collision also injured the 26-year-old Quincy man who owned the Cadillac and who was a passenger when McCoy struck the BMW. The 33-year-old driver of the BMW was also hurt, according to Conley’s office.

Travis Andersen can be reached at travis.andersen@globe.com.