Police are looking for two people who opened fire on a northwest Atlanta rooming house late Monday and killed one of the residents.

According to Atlanta police, a 31-year-old man was shot at the house in the 100 block of West Lake Avenue just before midnight. He was taken to Grady Memorial Hospital, where he went into cardiac arrest and died.

The victim was identified by the Fulton County Medical Examiner’s office as Ernest Baker Jr. of Atlanta.

“These individuals knew each other, and there was an altercation that just turned deadly,” Atlanta police Lt. Carven Tyus told Channel 2 Action News.

Police said the victim was involved in a confrontation with one or more people in the front yard hours before the shooting.

A witness told investigators that during the confrontation, one of the individuals claimed the victim stabbed him with a knife, police spokeswoman Officer Lisa Bender told The Atlanta Journal-Constitution.

About two hours later, police said they returned and began shooting. According to Channel 2 Action News, the gunmen shot at the outside of the house, realized the victim was not hit and charged inside.

Baker was shot several times in the chest in a bedroom.

As many as five witnesses to the shooting were cooperating with the police, Channel 2 reported.

An investigation is ongoing.

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The woman was found unconscious and was rushed to the hospital.