Aside from a few interesting performances from various cast members, CYRUS: MIND OF A SERIAL KILLER has virtually nothing going for it. You'd be better of going with alternative serial killer titles like HENRY LEE LUCAS: SERIAL KILLER or DEAR MR. GACY as at least these are films which attempt to tell a proper story rather than this nonsensical, made-up amateur-hour attempt.
The film begins with an elderly man being interviewed for a documentary about a serial killer. Kudos on the casting director for getting hold of Scream Queen Danielle Harris to play the reporter, but truth be told her acting isn't up to much. However, the subject of the interview is played by Lance Henriksen, who also narrates the story; he's by far the best thing in the whole film and I could listen to his gravelly voice all day. It's a shame that most of the material is beneath him.
After a mildly promising set-up in the first half-hour, this turns into a very silly gore flick with one grisly murder after another. It all feels very ho hum and uninteresting, repellent but not disturbing; just a waste of time and effort. Tiffany Shepis and Doug Jones both pop up to offer cameo appearances and lessen the boredom, but this is still one of the worst serial killer movies I've sat through. The most amusing thing about the film is that the whole thing seems to hinge around a final twist that will be obvious from the very first scene.