Student murder suspect Bryan Kohberger returnED to court Thursday, where his defense hopes to have the death penalty taken off the table before he goes to trial in the stabbing deaths of four University of Idaho undergrads.

The defense planned to call two expert witnesses at the hearing — forensic pathologist Dr. Barbara Wolf and University of Idaho law professor Aliza Cover, whose research has examined capital punishment and constitutional law.

Judge Steven Hippler denied both requests, siding with prosecutors who argued that their testimony would be irrelevant under Idaho law. The judge said he had also read an affidavit from Dr. Wolf and an article from Cover that largely summed up the testimony the defense expected.

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Kohberger’s team filed a number of attacks on the possibility of capital punishment last month, challenging it as a potentially cruel or unusual punishment, arguing that it goes against “contemporary standards of decency” and asserting that Idaho’s newly revived firing squad is unconstitutional, among other arguments. 

“It appears the defense is laying the groundwork for appeal,” said Matt Mangino, a former Lawrence County, Pennsylvania, district attorney and expert on capital punishment litigation. “Their most recent arguments are for an appellate court not a trial court.”

Those include taking issue with nearly all of the alleged aggravating factors and arguing that the firing squad is unconstitutional. While they’ve had some success, including dropping the aggravator for burglary that prosecutors agreed with, they face an uphill battle, Mangino said.

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“There has never been a method of execution determined by the Supreme Court to be unconstitutional,” he told Fox News Digital. “Whether someone has been hanged or gassed or electrocuted or shot, the Supreme Court has never said that any method like that, and also lethal injection, is unconstitutional.”

Although Idaho only recently brought back the firing squad as an option, it’s a reliable method that has been used both historically and in modern times, he said. 

“There was a pause in the death penalty in the early ’70s, and when the death penalty came back a few years later, the first execution in this country was by firing squad,” he said.

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He even wrote about a firing squad execution in his book, “The Executioner’s Toll, 2010,” which examined every execution carried out in the U.S. that year.

He did find one move by the defense legally interesting, he said. Courts commonly use two-step proceedings, known as “bifurcated trials,” with a guilt phase and a penalty phase for capital cases to prevent the death penalty from being handed down arbitrarily.

“They’re making an interesting argument that the process should be trifurcated, for lack of a better term,” he told Fox News Digital. 

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The defense has essentially proposed three phases, he said — a guilty phase, a new phase to determine the aggravating circumstances and then the penalty phase.

“That would really sort of turn the whole process on its head, because the Supreme Court has said, ‘Hey, bifurcated trials are a fair, less arbitrary way to do this,’” he said.

Under Idaho law, prosecutors had 60 days after Kohberger’s arraignment May 22, 2023, to announce they would seek the death penalty upon conviction if they intended to do so.

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About a month later, they sent that notice, alleging in court filings that the former criminology Ph.D. student “has exhibited a propensity to commit murder, which will probably constitute a continuing threat to society.”

Kohberger is accused of killing Madison Mogen, 21, Kaylee Goncalves, 21, Xana Kernodle, 20 and Ethan Chapin, 20, in a 4 a.m. attack Nov. 13, 2022. All four were staying in a six-bedroom home just steps from the University of Idaho campus.

Two housemates survived the attack, including one who told prosecutors she heard someone crying and saw a masked man leave.

Detectives found a Ka-Bar knife sheath under Mogen’s body, which prosecutors alleged in court filings had Kohberger’s DNA on the snap.

Kohberger was studying for a Ph.D. in criminology at neighboring Washington State University, less than 10 miles from site of the killings. He has a master’s degree in criminal justice from DeSales University in Pennsylvania.

A judge entered not guilty pleas on his behalf at the arraignment. His trial is expected to begin next year.