(Gresham, OR)  --  An investigation is ongoing into a shooting that injured the bouncer at the 2nd Street Bar in Gresham.  Police say the man was hit in the head by a bullet Saturday night, and he's expected to survive.  Police interviewed one person who a caller to 911 said was the suspect, but police say the person wasn't the shooter.  Detectives believe the shooting happened following an altercation between several people in the bar.