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An Oklahoma mother is dead after police say she was shot by her toddler son, Tulsa World reports.

Authorities say Christa Engles, 26, was changing her 1-year-old daughter’s diaper when her 3-year-old son shot her in the head with a semiautomatic handgun.

A neighbor told police the boy found the gun underneath a couch.

Engles was rushed to a nearby hospital, where she later died.

According to police, Engles’ husband was not home at the time of the incident.