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A 'cannibal killer' accused of murdering his ex-girlfriend before eating her body parts has stunned a court by branding the case 'bull cr*p'.

Joseph Oberhansley, 38, is said to have stabbed Tammy Jo Blanton to death with a knife after breaking into her home.

He reportedly used an electric jigsaw to open the the 46-year-old’s skull before scoffing parts of her brain.

He also allegedly ate part of her heart and a lung.

Police said Oberhansley confessed to the grisly crimes, including 'cooking a section of her brain and eating it', following his arrest in Jeffersonville, Indiana.

(Image: Mydrim Jones)

But now he insists he is innocent and let rip a 10-minute rant in a pre-trial hearing at Clark County Court.

He described the case against him as "all bull cr*p lies" and claimed Tammy Jo was "getting high and drunk and texting a bunch of bull crap".

Oberhansley also told the judge in the non-stop tirade he had uncovered new evidence that pointed to his innocence.

He suggested detectives had missed the murder weapon as it could not have been the "cheap little knife" investigators found.

Oberhansley ignored his frustrated lawyers who warned him to keep quiet.

(Image: Mydrim Jones)

The judge cautioned him to save his comments for his trial.

But then Oberhansley brazenly tried to hold a news conference on his way-out of court before sheriff’s deputies led him away.

Oberhansley was found mentally not competent to be tried in October 2017.

But a judge decided last November he was fit after a doctor found his competency had been restored at a psychiatric hospital.

Tammy Jo was found with parts of her skull removed under a vinyl camping tent draped over her bath in September 2014.

Cops also found a “plate with what appeared to be skull bone and blood” on it.

A skillet, a pair of tongs with blood on the handles and tissue were in the rubbish bin.

An autopsy revealed she died from multiple stab wounds and parts of her heart, lungs and brain were missing.

At the time of the murder, Oberhansley was free on parole for fatally gunning down his girlfriend Sabrina Elder, 17, in a drug-fuelled jealous rage in 1998.

He also shot his mum in the back and fired at his sister before tucking the weapon under his chin and pulling the trigger to give himself a “partial lobotomy.”

(Image: Mydrim Jones)

Prosecutor Jeremy Mull said after Oberhansley’s courtroom rant: “Well I’m certainly taking notes of everything that he's saying.

“And if there is evidence that is contrary to the things he’s presented now, presented at trial, I’ll certainly have these things to refer to.”

Oberhansley’s trial is due to start on August 19.

“He’s not going to be allowed to disrupt the trial,” Mr. Mull told news channel WAVE 3.

“He’s been given some latitude during the hearings. But once the trial starts, I’m confident this judge is going to cause the trial to go on without any interruptions.”

Oberhansley faces life in jail without parole if convicted.