Officers were responding to a domestic assault call between a man and his grandfather in the Brookland neighborhood.
A D.C. police officer responding to a domestic dispute was stabbed in northeast D.C. early this morning -- and then fatally shot the suspect.
Police say two officers responded to a domestic assault call between a man and his grandfather at 3511 17th Street NE in the Brookland neighborhood.
Police Chief Cathy Lanier said the grandson came up on an officer from behind, attacking him with a knife.
"This is pretty traumatic for all the officers that work together," Lanier said. "The last thing we ever want to do is take a life."
Investigators told News4's Pat Collins that the altercation began around 6:45 a.m. when the suspect, 28-year-old Justin Lionel Turner, entered the grandparents' home and began to hit a punching bag in a workout room, waking up the household.
His grandfather went downstairs to complain, and the grandson began punching him, authorities said. The grandmother called 911, but when the grandfather went outside to talk to officers, the grandson allegedly went outside with a knife.
The officer was stabbed him in the face, neck and hands, and in response, he fired his gun once, killing Turner.
The officer and Turner's grandfather were both taken to a hospital with injuries. Lanier said the officer's injuries were serious, but not life-threatening.
Stay with News4 and NBCWashington.com as we follow this developing story.