Police were responding to the 300 Block of West Prospect Street just before 10:30 p.m. after receiving 911 calls about shots fired in the area.
When they arrived, the man was still outside a house with his weapon in sight and rifle-trained officers took positions. The man went inside the home, but came back outside moments later and opened fire. Officers fired back, wounding the man.
According to police, the wounded man crawled back inside. A SWAT team robot entered the home later on and found the man dead.
"We have been out here in the past, and there have been reports filed at this location in the past," Patrick Michaud with Seattle Police Department said.
Police say they found weapons staged near the front door, including semi-automatic rifles, shotguns, and body armor.
No one else was hurt during the incident, and both officers involved in the shooting are on paid administrative leave, which is standard procedure, during the investigation.
Detectives from the Force Investigations Team as well as Crime Scene Investigators are processing the scene. It is unclear what the suspect was shooting at prior to and during officers' arrival.