Mark McPherson: I suspect nobody and everybody. I am strictly trying to get at the truth.
Waldo Lydecker killed Diane by accident, thinking that she was Laura. In his mind, if Laura could not be with him then anyone could have her, so with the help of the "twin clocks" he manages to hide a shotgun to kill Laura. Due to it being dark he could not see that it was really Diane. At the very end of the movie Waldo tries to kill the real Laura but is killed by a detective who accompanied McPherson to her apartment.
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