Home security cameras inside a Cottonwood Heights residence may have recorded the September 2024 killing of Utah National Guard member Matthew Johnson, according to a search warrant unsealed Monday, Aug. 3.

The warrant, filed in May 2026 by an investigator with the Salt Lake County District Attorney's Office and sealed for 90 days, reveals that Johnson had installed Eufy brand cameras inside the home and discovered through them that his wife, Jennifer Gledhill, was having an affair. The cameras were concealed within the residence, and recordings can be stored for extended periods, according to details reported by ABC4.

The investigator wrote in the warrant application that the concealed cameras may have captured Johnson being killed, or captured Gledhill cleaning up the crime scene, disposing of evidence, or moving his body from the residence, Fox 13 Investigates reported.

Investigators sought records from Eufy's parent company, Anker Innovations, for any cloud-stored footage linked to Johnson's account. The warrant does not state whether any video was actually recovered.

Salt Lake County District Attorney Sim Gill declined to discuss the findings, telling Fox 13 that the case is active and being rigorously prosecuted, and that his office would not comment further to protect its integrity. Gledhill's defense attorney did not return requests for comment.

What prosecutors allege

Johnson, 51, a member of the Utah National Guard's 19th Special Forces Group and former U.S. Marine, was last seen Friday, Sept. 20, 2024. The National Guard reported him missing to Cottonwood Heights police five days later when he failed to show for duty. Gledhill reported him missing three days after that, saying she hadn't seen him in a week.

Prosecutors allege Gledhill shot Johnson in the head with his 9-mm handgun while he slept on Sept. 21, 2024, then packed his body into a rooftop storage container, loaded it into her minivan, and buried him in a shallow grave north of their Cottonwood Heights home. A man with whom Gledhill was allegedly having an affair told police she confessed to the killing and provided investigators with text screenshots and audio recordings of their phone calls.

When Cottonwood Heights police searched the home in September 2024, they found a strong odor of bleach, walls and carpet that appeared wiped with the chemical, blood detected in recently cleaned areas, and a brand-new mattress in the bedroom.

Johnson's body has not been found.

More than 100 of his fellow soldiers have searched an area along the Great Salt Lake wetlands where prosecutors say GPS data placed Gledhill after the alleged murder.

Charges and trial

Gledhill, 43, faces nine felony charges: murder, five counts of obstruction of justice, possession with intent to distribute, abuse or desecration of a human body, and witness tampering. She has pleaded not guilty and remains jailed without bail.

Her trial has been delayed twice. Jury selection is now scheduled for Monday, Dec. 7, with trial dates running Dec. 8–11 and Dec. 14–16 before 3rd District Judge Adam Mow.

The newly unsealed warrant also confirmed that investigators obtained cell phone records for Gledhill's alleged romantic partner and data from several computers seized from the couple's residence.