The Bonney Lake man pleaded guilty Tuesday in Everett to manslaughter, kidnapping, robbery, burglary and assault.
The Daily Herald reports Frohs and a crew of motorcycle and prison gang members held a couple at gunpoint in December 2011 at a home where they were looking to retaliate against two men who had ripped off a drug dealer. The two men weren't in the home.
Frohs shot a member of his own group, 30-year-old Patrick "Bucky" Buckmaster of Tacoma, when he entered the home wearing a Jason-style goalie mask. His body was found a month later in a shallow grave.