Looking for an old porn movie

I've watched this porn movie in 90s, it's been too long so I can't promise the following details are 100% correct.
The porn is most likely about a murder case or a series of murder cases. I remeber one scene, where the killer meets up with a girl and has sex with her. I think the girl has long har, most likely brunette, probably in a white shirt and blue pencil skirt, big tits, pretty face. I think the killer strangled the girl to death during sex. I think the sex scene take place in a business building, in an office or reception or something, I can't be sure.