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Events in L.A. Noire
He is a patrol officer for the Los Angeles Police Department. He is first found in the mission "The Red Lipstick Murder" He is at the bottom of the hill on which Celine Henry was murdered, keeping the crowds back. He points out where the crime scene is to Phelps as he pulls up to the dirt road. He is seen again in "The Golden Butterfly" where he is the officer who puts Hugo Moller into custody.
He also appears during the case "The Studio Secratery Murder", in which he is an officer guarding the crime scene. Upon their arrival, Detectives Cole Phelps and Rusty Galloway are greeted by Walwick, who then leads them to the scene. He stands guard for the remainder of the time.