(Portland, OR)  --  A man wanted for homicide in Washington state is behind bars after being arrested at a gym in southeast Portland.  Police arrested 31-year-old Thomas Earl Cooper Junior at 24 Hour Fitness on Southeast McLoughlin Boulevard yesterday morning.  Arresting officers say they found a gun inside his locker at the gym.  Cooper was wanted in connection to a shooting at a nightclub in Lakewood, Washington in October.  One man was killed in the shooting and several others were injured.