3

The reason the killer wears a mask, is because he plans to frame another person (Bobby Slade) for the murders. He did not kill his first victim - Julie Jensen - whom he attacked in the same ritualistic manner as the murdered Mrs. Forrester. Julie Jensen would be a witness and implicate Bobby Slade in court. Bobby had slept with both women. Also, the ...


3

It has been many years since I watched it but I think that the main reason is to keep the audience guessing. In the character reason would be to conceal his identity in case somehow someone saw him or something unexpected happened. Remember that he was a smart meticulous character and would not leave things to chance, allowing everyone to see your face ...


3

I haven't seen the movie, but other than the big reveal at the end, it's also possible that the killer had his face hidden in case someone would happen to see him (either coming/going from the murder scene or else from a window). Other than that, I would have to agree that it's just a plot device.


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