A man arrested in the killing of a 68-year-old man during a carjacking at a gas station was found guilty of first-degree murder Friday, according to prosecutors.

Demarko Wheeler, 23, was also convicted of armed carjacking and related charges in the 2016 fatal shooting of Alonzo Jackson, the Prince George’s County State’s Attorney’s Office said Friday.

Jackson was pumping gas on the morning of July 20, 2016, when Wheeler shot him and tried to steal his 2015 Dodge Charger, prosecutors and police said. After getting in the car, Wheeler realized the key was not inside the vehicle. He then stood over Jackson with a gun and demanded the key, prosecutors said. Jackson’s car was later found abandoned and burned, police had said at the time.

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Jackson, a Marine veteran, had just taken his wife to work and was filling up at a gas station on Marlboro Pike before taking his best friend to a medical appointment, Jackson’s family said at a vigil two years ago.

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A jury deliberated for less than an hour before returning a verdict in the four-day trial, prosecutors said.

“Because of his crimes, a man who sacrificed and served our country, lost his life, and his family has lost their loved one,” Prince George’s County State’s Attorney Aisha N. Braveboy said in a statement. “My office will be requesting that the court impose a sentence that recognizes the heinous acts Mr. Wheeler committed.”

Wheeler faces life in prison and is scheduled to be sentenced July 23.

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