A 23-year-old soldier assigned to Fort Campbell was shot and killed while on leave in Georgia, according to the local district attorney general, Russel Johnson.

MarStratton Gordon was visiting his girlfriend at a home in Harriman when he as killed by a single shot at around 7:30 p.m. on Sunday evening.

A fifteen-year-old boy, whose name has not been released, is believed to be responsible for the shooting, according to a preliminary investigation by Harriman Police Department.

Investigators believe a domestic altercation occurred before the shooting. An autopsy of Gordon is being conducted at University of Tennessee Regional Forensics Center to determine an exact cause of death.

Gordon was believed to be on leave -in between deployments- visiting girlfriend Amber Kinney, according to his Facebook account.

MarStratton Gordon and Amber Kinney (Facebook)

MarStratton Gordon and Amber Kinney (Facebook)

A neighbor commented on the 15-year-old’s character to ABC 6, saying, “The young man, the young teenager, he was always offering to help me if I needed any help doing anything. Just real friendly, big old smile, very articulate.”

“That would be the last thing I’d expect to happen.”

Gordon’s half sister, Alexis Terry, talked to 10news about her recently deceased Army brother. She said her brother, whom she calls “Mar” was “a perfect gentleman. She said he was no the type of person to getting into fights, especially with a teenager.

She said the 15-year-old who shot her brother was his girlfriends brother -who was known by Gordon to have several firearms.

“I know he didn’t deserve to lose his life over an argument, and I don’t know what a 15-year-old boy was doing with guns,” Terry said.

The Harriman Police Department, the Tennessee Bureau of Investigation and the 9th Judicial District Attorney General’s Office are investigating the shooting.

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