The production's original climax was considerably more physically intimate and awkward than the version that reached theaters. The screenplay called for Detective Leo Kessler, played by Charles Bronson, to wrestle Warren Stacey to the ground during their final confrontation. Stacey, portrayed by Gene Davis, was naked at that point in the story, and Bronson refused to get up close and personal with the unclothed actor. The ending was consequently reshaped so that Kessler could stop Stacey without a prolonged physical struggle: after Stacey attacks the nursing dormitory and is cornered by the detectives, Kessler shoots him in the head. Davis also recalled that director J. Lee Thompson largely left him alone to construct the killer's personality, with the specific warning that Stacey should not become sympathetic. Other material was removed as well, including scenes involving Stacey and a ten-year-old girl and a gay man, underscoring how the film's already lurid conception was revised during production to manage its tone and its star's boundaries.
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