Stewart Fyfe was a henchman of Alex Oakwell's and assisted Alex in the kidnapping of Steve Marchant, Biff Fowler and Ned Glover. He gets into a fight with Zak Dingle but Stewart pulls out a gun so Paddy Kirk sticks a syringe full of anesthetic into Stewart's back.
After being injected with a possibly lethal dose of anaesthetic, Stewart was last mentioned to have been unconscious. It is unknown whether he lived or died. However, he must have come round as there was no mention of Paddy being a murderer/the police coming after Paddy.