By REBECCA BOONE and GENE JOHNSON

BOISE, Idaho (AP) — Bryan Kohberger has agreed to plead guilty to murdering four University of Idaho students as part of a deal to avoid the death penalty, an attorney for one victim’s family said.

Shanon Gray, an attorney representing the family of Kaylee Goncalves, confirmed Monday that prosecutors informed the families of the deal by email and letter earlier in the day, and that his clients were upset about it.

“We are beyond furious at the State of Idaho,” Goncalves’ family wrote in a Facebook post. “They have failed us. Please give us some time. This was very unexpected.”

They spoke with the prosecution on Friday about the idea of a plea deal and they explained they were firmly against it, the family wrote in another post. By Sunday, they received an email that “sent us scrambling,” and met with the prosecution again on Monday to explain their views about pushing for the death penalty.

“Unfortunately all of our efforts did not matter. We DID OUR BEST! We fought harder then anyone could EVER imagine,” the family wrote.

A change of plea hearing was set for Wednesday, but the family has asked prosecutors to delay it to give them more time to travel to Boise, Gray said. Kohberger’s trial was set for August in Boise, where it was moved following pretrial publicity in rural northern Idaho.

Kohberger, 30, is accused in the stabbing deaths of Goncalves, Ethan Chapin, Xana Kernodle and Madison Mogen at a rental home near campus in Moscow, Idaho, early on Nov. 13, 2022. Autopsies showed the four were all likely asleep when they were attacked, some had defensive wounds and each was stabbed multiple times.

At the time, Kohberger was a criminal justice graduate student at Washington State University, about 9 miles west of the University of Idaho. He was arrested in Pennsylvania, where his parents lived, weeks later. Investigators said they matched his DNA to genetic material recovered from a knife sheath found at the crime scene.

No motive has emerged for the killings, nor is it clear why the attacker spared two roommates who were in the home. Authorities have said cellphone data and surveillance video shows that Kohberger visited the victims’ neighborhood at least a dozen times before the killings.

The murders shocked the small farming community of about 25,000 people, which hadn’t had a homicide in about five years, and prompted a massive hunt for the perpetrator. That included an elaborate effort to track down a white sedan that was seen on surveillance cameras repeatedly driving by the rental home, to identify Kohberger as a possible suspect through the use of genetic genealogy and to pinpoint his movements the night of the killings through cellphone data.

In a court filing, Kohberger’s lawyers said he was on a long drive by himself around the time the four were killed.

In the letter to families, obtained by ABC News, prosecutors said Kohberger’s lawyers approached them seeking to reach a plea deal. The defense team had previously made unsuccessful efforts to have the death penalty stricken as a possible punishment, including arguing that Kohberger’s autism diagnosis made him less culpable.

The prosecutors said they met with available family members last week before deciding to make Kohberger an offer.

“This resolution is our sincere attempt to seek justice for your family,” the letter said. “This agreement ensures that the defendant will be convicted, will spend the rest of his life in prison, and will not be able to put you and the other families through the uncertainty of decades of post-conviction, appeals. Your viewpoints weighed heavily in our decision-making process, and we hope that you may come to appreciate why we believe this resolution is in the best interest of justice.”

In a Facebook post, the Goncalves family wrote that Kaylee’s 18-year-old sister, Aubrie, had been unable to attend the meeting with prosecutors. But she shared her concerns in a written statement.

“Bryan Kohberger facing a life in prison means he would still get to speak, form relationships, and engage with the world,” Aubrie Goncalves wrote. “Meanwhile, our loved ones have been silenced forever. That reality stings more deeply when it feels like the system is protecting his future more than honoring the victims’ pasts.”

In Idaho, judges may reject plea agreements, though such moves are rare. If a judge rejects a plea agreement, the defendant is allowed to withdraw the guilty plea.

Earlier Monday, a Pennsylvania judge had ordered that three people whose testimony was requested by defense attorneys would have to travel to Idaho to appear at Kohberger’s trial.

The defense subpoenas were granted regarding a boxing trainer who knew Kohberger as a teenager, a childhood acquaintance of Kohberger’s and a third man whose significance was not explained.

A gag order has largely kept attorneys, investigators and others from speaking publicly about the investigation or trial.

Johnson reported from Seattle. Associated Press reporter Mark Scolforo contributed from Stroudsburg, Pennsylvania.