PORTLAND, Ore. - Police released new details Wednesday regarding an apparent homicide, a fire, an officer-involved shooting and a second death all at the same northeast Portland home a night earlier.

According to police, it all started after a woman called 911 about 8:30 p.m. Tuesday saying she had witnessed a homicide. After talking to her, officers went to a home in the 9100 block of Northeast Glisan Street where she said the death had occurred.

As police arrived, a man later identified as 27-year-old Jason Spoor walked outside, saw the officers and then quickly ran back inside the home, police said.

Several minutes later, Spoor returned outside with a handgun, police said. As officers repeatedly told him to drop the weapon, they heard crackling sounds and smoke coming from the house.

Police said two officers fired at Spoor after he ignored their commands to drop the gun and instead continued to walk toward officers at the scene. Following the shots, Spoor fell to the ground and died, police said.

An autopsy determined Spoor died from a single gunshot to the head, police said.

However, investigators on Wednesday were still trying to figure out whether Spoor died from the officers' bullets or from a self-inflicted wound.

Following the shooting, another man came out of the home and was taken into custody, police said. That man was not immediately charged with anything.

Firefighters then extinguished the house fire, and police found the body of a man who appeared to have been shot inside the home, police said.

Police have linked Spoor to that apparent homicide.

Police said the woman who initially called 911 has had prior contact with law enforcement in connection with drug investigations, and the whole incident Tuesday may be related to drugs. They did not immediately identify her.

Authorities identified two officers who fired on Spoor as 45-year-old Timothy Bacon, a 14-year veteran of the police bureau, and 32-year-old Scott McCollister, a 7-year veteran of the bureau.

McCollister was involved in a deadly police shooting in 2003 involving a woman named Kendra James and was suspended for six months without pay. That decision was later overturned.