What's the name of an Old Movie w/ a Naked Serial Killer knocking on a door acting like a Flower Delivery guy?

Question by LCH123: What is the name of an Old Movie w/ a Naked Serial Killer knocking on a door acting like a Flower Delivery guy?
I keep in mind a lot of years ago watching a movie but I don't know what it is. All I can don't forget is a naked serial killer (man) knocking on an apartment door holding flowers up real close to the peep hole stating he was a Flower Delivery Individual. He killed the young lady in the apartment. For some reason I often believed it had Charles Bronson in it

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