Jessica Faulkner told police that she and her son were home alone when she left him briefly to use the restroom. While she was gone, she said she heard a gunshot.
She rushed to the back bedroom, where she found her son lying on the floor next to the bed, according to police. He had an injury on his head, officials said. She immediately called for help.
A preliminary investigation found that the boy apparently found a loaded pistol in the back bedroom and accidentally shot himself, police said.
Authorities continue to investigate.