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Evemts of L.A. Noire
Keller is encountered during the side-mission "The Blue Line", in which he is involved in a shootout with a gang of bank robbers. Upon their arrival, Detectives Cole Phelps and Roy Earle are briefed on the situation by Keller. Afterwards, Keller aids the detectives as well as other patrolmen as they advance and kill the gangsters.
He is also present in "The Gas Man", where he was an officer present at the Sawyer house fire. He brought the Sawyer's neighbour Joanna Alford to detectives Phelps and Herschel Biggs, with information about the fire.