The suspect in the fatal shooting of Cowlitz County Sheriff's Deputy Justin Derosier is identified as Brian Butts.
Butts was shot and killed during a standoff with police Sunday night.
Butts is the brother of Daniel Butts who pleaded guilty last month to the murder of Rainier Police Chief Ralph Painter in 2011.
Brian Butts was in his mother's motor home when he allegedly shot Derosier.
Investigators say Butts had been hiding in the woods near where he was found since the shooting.
Police also arrested Matthew and Michael Veach. Matthew Veatch is accused of hiding the gun used in the shooting of Derosier. Michael Veatch is being held on a previous warrant.