CAMERON COUNTY, Texas (KTRK) -- A family is mourning, and a father is facing a felony charge after a 4-year-old died from a self-inflicted gunshot wound in South Texas, according to the Cameron County Sheriff's Office.

The accidental shooting happened on Oct. 1 when the child's parents entered a store and left him inside the family's car by himself, the sheriff's office said in a release.

According to investigators, the child's father left an unsecured handgun in the center console of the vehicle.