A man who was being robbed Wednesday morning in Southeast Washington wrested a shotgun away from a gunman and fatally shot his attacker, D.C. police said Thursday.

The man who died was identified as Channel Johnson, 18, of Southeast Washington. Police said they questioned the man who was robbed but have not filed charges. The incident has been classified as a death investigation, and is continuing. Police initially said that Johnson was shot in the back and died at an area hospital.

Police said the shooting occurred about 11 a.m. in the 2400 block of Ainger Place SE, between Langston Place and Alabama Avenue in the Garfield Heights neighborhood. The dead man’s dark-colored jacket and shotgun remained on the sidewalk after the shooting.

Authorities declined to identify the man who was robbed. A police report says only that he is 22 years old. The Washington Post reached the man, who has moved out of his home near where the shooting occurred, but he declined to comment. His uncle said the man is still shaken.

“It’s unfortunate, what happened,” the uncle said.

Johnson’s mother, Luciette Johnson, 39, said police have told her little of what happened to her son, but she does not think he tried to rob a man or that he had a gun. Johnson, who lives in Anacostia, does not have an adult record. His mother said he had been arrested as a juvenile, but not on charges as serious as armed robbery.

She questioned whether the other man had to shoot her son. “If he had the gun, like the police say, then why did he have to shoot?” she asked. Johnson said her son told her he was visiting a friend in Garfield Heights, about a mile from where he lives with his mother and seven siblings in Anacostia.

The shooting that claimed Johnson’s life was the first of at least three in Southeast Washington on Wednesday, none of which police think are related. About 2:30 p.m., police said a man was shot in the 1100 block of Howard Road SE, near the Anacostia Metro station. He was listed in critical condition. And about 4:10 p.m., a juvenile was shot in the leg at 22nd Street and Alabama Avenue SE.