Sumner, Bonney Lake and Puyallup officers first responded to a home in the 7000 block of 142nd Avenue East just before 3 p.m. after getting a 911 call from a man threatening suicide.
Police say the man locked himself inside his house and refused to come out, at which point the Metro SWAT team was called in.
At 4:19 p.m., the 47-year-old man walked out of the house and pointed what "appeared to be a gun" at officers, according to Sumner police. Police would not confirm that the object was indeed a gun.
When the man refused to put the weapon down, a Milton police officer working on the SWAT team fired a single shot at the man, killing him.
That officer has been placed on paid administrative leave while the shooting is investigated.
The investigation is ongoing, but police say the incident could be a case of "suicide by cop."