Red Heat (1976)

"A group of film makers in Las Vegas and get caught up in a bizarre mystery."

Cindy Lou Sutters casts a striking redhead she dubs Red Heat to star in her latest movie. After Red Heat catches her boyfriend with another woman, she goes crazy and stabs him to death. Red Heat proceeds to embark on a murderous spree throughout Las Vegas. Sutters recasts the lead for her feature and gets down to the basics of making the movie. Meanwhile, a thief on a motorcycle robs everyone he encounters.