A Florida mother was charged in the death of her husband after their 2-year-old son appeared to fatally shoot him in the back, authorities said Monday.

Marie Ayala, 26, was charged with one count of manslaughter by culpable negligence after failing to properly secure a Glock handgun that the boy is believed to have shot his father with while he was playing a video game, according to an arrest affidavit from the Orange County Sheriff’s Office.

The boy’s 5-year-old brother told authorities that his sibling accidentally fired the gun, the affidavit says.

Ayala said that she heard a “loud pop” and found her husband on the floor, then began CPR. Mabry later died of his gunshot wounds in hospital.

Ayala told investigators that the couple and their three children — including an infant — were in the bedroom of their Orlando home on May 26 when the gun went off and a bullet struck her husband, Reggie Mabry. The Glock was loaded at the time.

Ayala said the gun had been kept under a pillow, in a box in the closet, and sometimes in a safe that was broken, the affidavit says. At the time of the shooting, she said it was in a bag near some dirty laundry, though she added that the weapon could have slipped out of the bag while it was being hung on the wall, the affidavit says.