Idaho murder victim Ethan Chapin’s sister shared the last text the University of Idaho freshman sent her just before he was killed in a home near campus on Nov. 13, 2022.

Bryan Kohberger, 30, recently accepted a plea deal and confessed to killing Madison Mogen, 21, Kaylee Goncalves, 21, Xana Kernodle, 20, and Ethan Chapin, 20, in a 4 a.m. home invasion attack nearly two-and-a-half years ago.

The night before the murders, Mazie Chapin — the triplet sister of Ethan and Hunter Chapin — had her sorority formal on Saturday evening and invited Ethan to be her date since she did not have one and his friends were going, Mazie says in a new Amazon Prime documentary series about the murders titled, “One Night in Idaho: The College Murders.“

“I don’t usually invite anyone to formals, but some of Ethan’s friends were going, and he wasn’t going,” Maizie says in the docuseries. “So, I was like, ‘OK, you can just be my date.’ It was super fun.”

In this photo provided by Stacy Chapin, triplets Maizie, left, Ethan, second from left, and Hunter, right, pose with their parents Stacy and Jim Chapin at Priest Lake in northern Idaho in July 2022. Ethan Chapin was one of four University of Idaho students found stabbed to death in a home near the Moscow, Idaho campus on Sunday, Nov. 13, 2022. Police are still searching for a suspect in the case. (Stacy Chapin via AP)

Kohbeger is expected to receive four consecutive terms of life in prison without parole, plus another 10 years.

As part of the deal, he waived his right to appeal and the right to move for a future sentence reduction.

Kohberger’s trial would have begun in August.

Fox News Digital’s Michael Ruiz contributed to this report.