IDAHO FALLS, Idaho — An Idaho man pleaded guilty this week to second-degree murder in the Nov. 8 murder of his fiancee.

Jeremy White changed his plea Thursday from not guilty to guilty during a court hearing.

Judge Bruce Pickett asked White why he was changing his plea.

“I had an argument with Christin Caldwell and I willfully strangled her knowing it would take her life from her,” White said.

Under the terms of the plea agreement, White will serve 15 to 45 years in prison but he first must tell investigators what happened the night he admittedly killed his fiancee, the Post Register reported ( ).

Court records show Caldwell’s body was found with marks on her neck after her body was exhumed Nov. 10.

White fled Idaho Falls on Nov. 9 in Caldwell’s Jeep with co-defendant Deena Aday. White and Aday were arrested Nov. 25 in Pahrump, Nevada, after they were seen leaving a home owned by White’s father.

Bonneville County Sheriff’s Office deputy David Schwartz said he had reviewed text messages between White, his supervisor at work and friends that indicated he had made plans to leave town with Aday before Caldwell was killed.

“He made plans at that point to leave the area with Miss Aday and start a new life with her,” Schwartz said in an audio recording of a probable cause statement given to obtain an arrest warrant for White.

White texted his supervisor Nov. 8 and told him he would not be at work because he was reportedly taking Caldwell to the hospital, Schwartz said.

White had used Caldwell’s cellphone Nov. 8 to contact her daughters and Caldwell’s mother, telling them that Caldwell was sick and that he had taken her to the hospital, Schwartz said.

Caldwell’s daughters reported their mother missing Nov. 10 after they could not reach White or Caldwell.

White is scheduled to be sentenced Sept. 20.

Aday is facing up to five years in prison on one count of accessory to a felony by willfully withholding knowledge of a felony. A jury trial is scheduled for Sept. 25.

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