Teen fatally stabs mother’s boyfriend in Hybla Valley during alleged assault, police say

(Updated at 3:40 p.m.) A teen was taken into police custody after allegedly stabbing and ultimately killing his mother’s boyfriend in a Hybla Valley apartment last night (Sunday), police say.

Officers were called to the apartment in the 7900 block of Janna Lee Avenue just before 10 p.m. after the teen reported that his mother was being assaulted by her boyfriend, Fairfax County Police Department Second Lt. James Curry said in a brief update at 1 a.m.

Marcus Roberson, a 32-year-old D.C. resident, was transported to a nearby hospital with stab wounds to his upper body, according to police. He died at the hospital.

“Detectives are actively investigating to determine the circumstances that led to the stabbing,” Curry said.

An initial investigation appears to have backed up the teen’s report to police:

Preliminarily, detectives from our Major Crime Bureau and Crime Scene Section determined Roberson was visiting the address when a verbal argument escalated into an assault. The juvenile teenager reported he stabbed Roberson to stop the assault. There were three other children inside the apartment that were unharmed. The woman was treated at the scene for injuries not considered life threatening.

According to the FCPD, the teen was released to his mother after being interviewed last night and hasn’t been charged for the stabbing, which detectives believe may have been “a justifiable homicide.”

“Detectives continue to conduct interviews and process evidence recovered from the scene to determine the circumstances that led up to the fatal stabbing,” the police department said.

Charges may be filed at a later date based on a consultation between police and the Office of the Fairfax Commonwealth’s Attorney. An autopsy will be conducted “in the coming days” to confirm the cause and manner of Roberson’s death.

This is the second fatal stabbing seen in Fairfax County this year. The previous incident on Jan. 10 also reportedly stemmed from domestic violence, as an adult man in McLean allegedly stabbed his mother and stepfather, who died.

Officers are on scene of a domestic-related fatal stabbing in the 7900 blk of Janna Lee Avenue, Alexandria. A man was stabbed in the upper body. He was taken to hospital where he was declared deceased. Person of interest is in custody. Detectives are responding to investigate. pic.twitter.com/3DVYF6yAFV

— Fairfax County Police (@FairfaxCountyPD) January 30, 2023

NOW FATAL stabbing in the Mount Vernon area. @ffxnow https://t.co/0OFWumNyY0

— Alan Henney (@alanhenney) January 30, 2023