Published: Nov 15, 2011 11:35 PM EST
Updated: Nov 16, 2011 12:24 AM EST

COLLIER COUNTY, Fla.- The most chilling part of the detailed crime scene report is what investigators found when they walked into Christopher Serna's home.

Resting on the area rug was a metal drum leg from his drum set. Located on the drum leg, the victim's head. He's accused of killing his ex-girlfriend Suzanne Bishop.

"This is very, very, very bizarre and unusual. What you'd expect from a psychological thriller or some movie," says Omar Rieche, M.D.

He hasn't examined Serna, but was able to give insight into the gory evidence and what he says could be a crime of rage, hate and anger against his ex.

Aside from the obvious, decapitation and blood covering most of the crime scene, deputies noticed two Texas Chainsaw Massacre posters, one saying, "Can you survive?"

"Sometimes we see individuals attracted and drawn to the dark side of music, culture. Sometimes it reinforces already day-to-day how they feel, how they're living. It may not have influenced him to do the act, but kept him in that state of mind," says Rieche.

Deputies also believe Serna carved some type of CD cover into Bishop's stomach and displayed some of her female anatomy around the house.

"There's no respect for the body or the person. It goes beyond what we can really imagine," said Rieche.

We may never know why the crime happened, but the clues left behind leave no question about whether Serna was troubled. On his own body, tattoos from a song titled "Candidate for Suicide."