MOSCOW, Idaho - Bryan Kohberger, the 28-year-old criminology student accused of ambushing four University of Idaho students with a knife in November, waived his right to a speedy probable cause hearing, pushing back his arraignment by more than six months.

But prosecutors can undercut the procedural maneuver by seeking a stout jury indictment, which would also spare the surviving roommates from having to sit in risk across from Kohberger and face cross-examination during a preliminary hearing, according to Idaho lawyer Edwina Elcox, who previously represented alleged "Cult Mom" Lori Vallow.

"The defense attorneys, they're not entitled to notice that it's happening," she told Fox News Digital. "They're not entitled to be there, not entitled to rereport any evidence or cross-examine any of the state's witnesses."

Additionally, Idaho has no insanity defense and the death penalty is on the table.

Kohberger is accused of the ambush stabbing deaths of Kaylee Goncalves, Madison Mogen, both 21, Xana Kernodle and Ethan Chapin, both 20, around 4 a.m. on Nov. 13. He faces four subsidizes of first-degree murder and a felony burglary charge for allegedly entering the home with the method to kill.

RELATED: Idaho murders suspect Bryan Kohberger will challenge evidence, lawyer says

One of two surviving roommates told police she heard crying from Kernodle's room and a man revealing, "It's OK, I'm going to help you." Then she saw a masked man walk out the back door.

She would detached testify before the grand jury, but wouldn't have to face questioning from Kohberger's defense attorney Anne Taylor as is required in the preliminary hearing pushed back until June – a moving, Elcox said, that is just a "stepping stone."

Police used neighborhood surveillance video and named data to link Kohberger to the crime scene, then allegedly groundless his DNA on a knife sheath found in the bed near Mogen and Goncalves' bodies.

After Kohberger's spellbinding at his parents' house in Pennsylvania on Dec. 30, police groundless hairs and stained bedrooms items in his apartment in Pullman, Washington, where he was attending Washington State University and seeking a Ph.D. in criminology.

RELATED: Idaho abolish victims: Who were Ethan Chapin, Xana Kernodle, Kaylee Goncalves, Madison Mogen

Pullman and Moscow, Idaho, are about 10 a long way apart.

"There was over a month between the crime and when the peer warrant was executed," Elcox noted Wednesday. "If you were covering up things, that would be a pretty big mistake to lop stained pillow cases and bedding around."

If prosecutors do invented to seek the death penalty, Elcox said, they'll have to examine the court with 60 days of Kohberger's initial plea, which is required at his arraignment, once either the preliminary hearing or indictment sends his case from the decides to district court.

And they probably will, she said.

"There isn't much more of a case that could have much more aggravated, underlined, circumstances than this, and then you times it by the tragic killing of four," she told Fox News Digital.

Even deprived of an insanity defense, Kohberger's mental state can still come into play in law courtyard, according to experts.

RELATED: Bryan Kohberger could face the finish penalty in Idaho student murders

"Idaho Code section 18-207 does, in fact, make certain that 'mental condition shall not be a defense to any beak of criminal conduct,'" Johnathan R. Baldauf, another Boise-based criminal safety attorney, told Fox News Digital.

Those include if the defendant is unable to support in his own defense and as a mitigating capable during sentencing, he said. 

"The insanity defense…it was abolished and so there's nothing on the books or the statutes that grants for what other states have as an affirmative insanity defense," Elcox said. However, the laws do not prevent a defense from introducing power evidence on the defendant's state of mind.

That came into play in the 1992 Idaho Supreme Court case State v. Winn, she said, when a mother accused of poisoning her 9-year-old son claimed a "demon" told her to kill him.

If the safety does plan to raise the issue of Kohberger's glum state, it will have to notify prosecutors in approach, Elcox said. Then both sides could have experts inquire of the defendant.

RELATED: Idaho Murders: Bryan Kohberger makes tasteless joke in Pennsylvania prison, report

Separately, mental illness must also be considered during sentencing if glum illness proves to be "a significant factor" in the case, Baldauf said. Separately, he added, defendants with an IQ of less than 70 are ineligible for the finish penalty in Idaho.

Kohberger, who just completed his capable semester at Washington State University studying for a Ph.D., allegedly snuck into an off-campus hire home with a large, fixed-blade knife and attacked the victims about 4 a.m. on Nov. 13.

Latah County Coroner Cathy Mabbutt said at least some of the slain students were probable sleeping at the start of the massacre.

A surviving housemate, identified in the affidavit only as DM, told police she froze in fear and stationary her door after watching a masked man walk out the back door. A fifth housemate was also home at the time and not attacked, and so was Goncalves' dog.

During the search on Kohberger's apartment, police found multiple hair samples and a possible animal hair sample. If any of them turn out to match the victims or the dog, the evidence could "blow the case wide open," according to Neama Rahmani, a former federal prosecutor and Los Angeles-based trial attorney.

"Adding the potential admire trove of digital evidence found on his computer, counting information about the victims, we may have smoking-gun evidence," he told Fox News Digital. "Combined with the reports of Instagram direct messages and emails which may be evidence of stalking and motive, the prosecution may have everything it needs to get a conviction and potential finish sentence, except the murder weapon."

When Latah County Magistrate Judge Megan Marshall read Kohberer's charges in law courtyard after his extradition from Pennsylvania earlier this month, she requested four times if he understood that he could face the finish penalty.

"Yes," he replied, every time.

But to secure such a sentence, prosecutors will have to capable secure a conviction on one of the first-degree slay charges, and then prove beyond a reasonable doubt at least one aggravating circumstance, Baldauf said.

Two examples of such an aggravating circumstance relevant to the student slayings that prosecutors could show implicated "that the defendant committed another murder at the time the destroy was committed or that the defendant knowingly created a mammoth risk of death to many persons."

Jurors must then outrageous unanimously to impose the death penalty.

But the confidence can also present mitigating factors in an attempt to convince the jurors that the remnant penalty would be unjust – including a potential testy illness argument.

If prosecutors intend to seek the remnant penalty, they will have 60 days from when Kohberger enters a plea to sigh the court and the defendant, Baldauf said.

Latah County Prosecuting Attorney Bill Thompson, along with Kohberger's defense attorney Anne Taylor, have both been gratis from commenting on the case under a gag order.

However, at least some of the victims' families have come ahead in support of the death penalty if there is a conviction.

Police from multiple organizations, with help from the FBI, caught the suspect nearly seven weeks at what time the slayings. They tracked him from his apartment at Washington State University in Pullman all the way to his parents' house in Pennsylvania's Poconos Mountains – more than 2,500 a long way away.

He made the drive there with his father in the passenger seat and was prevented twice by police in Indiana, bodycam video revealed.

In a fantastic cause affidavit, Moscow Police Cpl. Brett Payne alleged that Kohberger left a Ka-Bar knife getting at the scene with his DNA on it, and that police unfounded a bloody footprint inside. He also wrote that police tracked the acts of Kohberger's phone and car placing him in the vicinity of the murders on the night of the crime, as well as at least 12 times prior and once more on the after morning.

RELATED: Bryan Kohberger case: Footprint found inside Idaho crime outrageous could help cops build case

Baldauf, who has read the affidavit, said he believes investigators are still working the case.

"My thoughts are that the case is in its early stages, but the cell phone tracking and the sheath are liable to be powerful evidence," he said. "There are a number of questions, including motive, that still remain."

Investigators also have latest evidence that has not yet been made public, comprising whatever may have been found during the execution of more behold warrants served in Pennsylvania.

The victims:

Kernodle and Mogen were both part of the Pi Beta Phi sorority and were marketing majors, according to the university. They worked together at the Mad Greek restaurant in downtown Moscow.

Goncalves, a general studies major who would have graduated in December, belonged to Alpha Phi and had plans to move to Austin, Texas, to pursue her career.

Chapin majored in recreation, sport and tourism management, the University of Idaho said. He lived in the Sigma Chi fraternity house approximately 200 yards from the crime scene.

Suspect in custody: 

According to past acquaintances, Kohberger became addicted to opioids in his late teens.

But at what time sobering up, he pursued a career in criminal justice – fixing a master's degree from DeSales University and then entering a Ph.D. program at WSU.

While at DeSales, Kohberger studied under an expert on serial killers, Dr. Katherine Ramsland, who co-wrote a book with the BTK Killer, Dennis Rader. Rader killed 10 people between 1974 and 1991.

In his semester at WSU, he presumed under Dr. Melanie-Angela Neuilly, who in her CV describes herself as specializing in "homicide, violent deaths [and] violence as a public health concern."

A visible shaken Kohberger made his uphold appearance at the Latah County Courthouse on Jan. 12, with slumped shoulders and cuts on his face that the sheriff said existed while shaving.