The son of an Ohio State Trooper died on Mother’s day after accidentally shooting himself in the head with his father’s work-issued gun, authorities said.

Evan Sun, 4, died Sunday at approximately 12:52 p.m. after sustaining a single gunshot wound to the face, the Lucas County Coroners Office said.

Authorities believe that Evan found an “unsecured weapon” which belonged to his father who serves as an Ohio State Trooper. The firearm was used as a “back-up” weapon.

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Sergeant Tiffany Meeks with the Ohio State Highway Patrol identified the father as Trooper Fu Z. Sun with the Toledo division.

Despite the coroner’s ruling that the death was accidental, Meeks said the department would be conducting its own internal investigation into the shooting, which she said involved a “division-issued” gun.

Patrol Superintendent Richard S. Fambro called the death of Sun’s child a “devastating loss” in a statement to Fox News.

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“There are no words to describe such a loss," Fambro said. "Our thoughts and prayers have been, and will continue to be, with Trooper Sun, his family, friends and co-workers.”

Meeks said the Toledo Police Department would be leading the investigation into Sunday’s shooting.