Prince George's County Police investigate a homicide Monday morning at a BP gas station in Forestville. (Lynh Bui/The Washington Post)

Two men have been arrested in Monday’s fatal shooting of a Prince George’s County man, county police said Tuesday.

Dominick Payne, 19, was arrested Monday near the scene of the shooting, a BP gas station in District Heights. Alex Micah Marshall, 22, was arrested Tuesday in the District, where both men live. Payne and Marshall were charged with first- and second-degree murder.

Dalonte Allen Jackson, 25, was found in the gas station’s lobby about 3 a.m. with a gunshot wound. He was taken to a hospital, where he was pronounced dead. Authorities said Jackson may have been targeted and killed in a drug-related robbery.

Jackson was the oldest of six children, the first grandchild and great-grandchild in a tightknit Fort Washington family. He died the day before his sister Jasmine turned 17.

Jackson left behind no children, a fact his mother lamented.

“I don’t have anything to remember him by,” Sherresse Jackson said.

Jackson was a caregiver, his aunt Nichelle Jackson said, who helped tend to a mentally disabled cousin and the children of women he dated. She helped raise him, along with his grandmother and his mother. Jackson was a sports fan who used his vacation time to travel to Morgan State University in Baltimore, where his brother, DeWayne, was a basketball player.

“He was a normal, average guy, trying to survive out here,” she said. He was working on getting a job with Dish Network, she added.

Jackson had been in some trouble with the law over the years, starting with a 2006 assault charge and ending with a domestic dispute in August. His aunt said that she called police that day because of a fight over a girl he was dating but that she had not wanted to pursue the case.

“He could be mean, but he had a beautiful heart,” his mother said.

“He was getting his life right. He was doing the right thing.”