A 20-year-old man fatally stabbed his brother and injured another family member before turning a gun on himself, Fairfax County police said.

Police on Thursday released these new details about the fatal domestic incident, which happened inside a home in the 4100 block of Travers Court in Chantilly on Tuesday morning.

According to police, the suspect stabbed his brother, 24-year-old Haseeb Raza, in the upper body.

A second family member, a 61-year-old man, tried to intervene and also was stabbed in the upper body, police said. The suspect then apparently shot himself in the upper body, police said.

All three men were taken to local hospitals. Raza died from his injuries, but police said the other victim is expected to recover. The suspect remains hospitalized with life-threatening injuries.

The identities of the suspect and the older victim have not been released by police.

Police said that two young children and other adults were in the home at the time of the incident, but they were not involved and not injured.

It’s unclear what led to the confrontation and the incident remains under investigation.