CAPITOL HEIGHTS, Md. — A Washington, D.C., man has been sentenced to 70 years in prison for killing and carjacking a Marine veteran at a Maryland gas station.

The Washington Post reports 23-year-old Demarko Wheeler was sentenced Tuesday for first-degree murder in the 2016 shooting death of 68-year-old Alonzo Jackson.

Jackson’s relatives said Jackson dropped off his wife at work that July morning and then stopped for gas in Capitol Heights so he could drive his best friend to a doctor’s appointment.

Prosecutors say Wheeler approached Jackson at the gas station, shot him and stole his car, which was later found abandoned and burned. At the time, Wheeler was on pretrial release in another armed carjacking that happened in the District a week prior. That case still is pending.