BLACKFOOT — A 17-year-old boy has pleaded guilty to second-degree murder for killing a 30-year-old Blackfoot woman last fall in what he told police was a revenge killing.

Bobby Grant Jackson entered the guilty plea Jan. 29 in the October 2025 shooting death of Rebecca Rivera, according to a press release from the Bingham County Prosecuting Attorney’s Office.

Jackson pleaded guilty pursuant to a binding plea agreement. Under the terms of the agreement, Jackson’s defense attorney Jordan Scott Crane of Idaho Falls will recommend a sentence of no less than a mandatory 20 years in prison, while prosecutors will recommend no more than 27 years. Both parties will be free to argue for the length of the indeterminate portion of the sentence.

Jackson is scheduled to be sentenced March 4 at 9 a.m. before 7th District Judge Daniel R. Clark.

Jackson was originally charged with first-degree murder after allegedly stealing a handgun from a co-worker at State Hospital South in Blackfoot on Oct. 23, then fatally shooting Rivera at her mobile home when she refused to give him a ride to Pocatello.

According to police reports, Jackson told detectives during a post-arrest confession that he recognized Rivera and targeted her intentionally because he believed her brothers had killed his friend. When asked if he intended to kill Rivera as payback, he confirmed he did, court records show.

Jackson fled on foot after the shooting, triggering an intense manhunt involving multiple East Idaho law enforcement agencies. He was arrested without incident at a Pocatello residence in the early morning hours of Oct. 24.

Jackson remains held at the 3B Juvenile Detention Facility near Idaho Falls.