BLACKFOOT, ID – A teenager in eastern Idaho faces a first-degree murder charge after authorities allege he shot a woman inside her mobile home following a series of escalating events that began at his workplace.

Bobby Grant Jackson Jr., 16, is accused of killing 30-year-old Rebecca Rivera on Thursday afternoon with a handgun that he allegedly stole earlier that day while on a job renovating a hospital. Prosecutors say Jackson carried out the shooting after Rivera refused his request for a ride, and because he harbored anger over a belief that her family had been involved in the death of one of his friends.

Officers were called to the mobile home located on the 1100 block of Broadway Street around 4 p.m. after Rivera’s relatives discovered her with a fatal gunshot wound. Detectives soon pieced together a timeline that led back to Jackson, who had been working as a subcontractor at a nearby hospital on Thursday morning.

According to investigators, a colleague reported that Jackson left the worksite after asking to use the restroom, only to vanish for an extended period. The colleague later noticed that his handgun, which he kept in a lunchbox in his truck, was missing—prompting a call to police.

Footage from security cameras indicated Jackson was seen near the colleague’s vehicle, reaching inside, before leaving the area. At the time, Jackson was reportedly living at a halfway house due to a previous arrest related to armed robbery, and authorities were able to track his phone to a gas station just blocks from Rivera’s home and close to the crime scene.

Witnesses in the neighborhood recalled seeing Jackson earlier in the day, approaching residents and asking for a ride. Security images showed him present at the trailer park shortly after 12:40 p.m. Rivera’s death was ultimately linked to a 9 mm handgun, the same type as the weapon reported missing from the worksite.

After the murder, Jackson was located Friday in Pocatello, approximately 25 miles from Blackfoot, and taken into custody. Investigators say there was no prior relationship between Jackson and Rivera.

Court documents reveal that during questioning, Jackson admitted to the shooting, telling detectives his motive stemmed both from Rivera’s refusal to drive him and his own suspicions about her family’s involvement in his friend’s death. Prosecutors initially sought a second-degree murder charge, but after reviewing the interview and evidence, the charge was upgraded to first-degree murder.

Jackson, now being prosecuted as an adult, is currently held on a $1 million bond at the 3B Detention Facility. His next court appearance is scheduled for November 6.

Authorities in Blackfoot continue to investigate the sequence of events leading up to the deadly shooting and have not released further details regarding the previous incident involving Jackson’s friend or any concrete connections to Rivera’s family.