The son of Dallas Area Rapid Transit (DART) Officer Brent Thompson was found dead of apparent suicide Monday in Corsicana, TX.

Corsicana police said they found William Thompson, 19, dead from an apparent self-inflicted gunshot wound early Monday at a park, Fox 4 News reports.

Brent Thompson was one of five officers killed in the deadly July 7, 2016, sniper attack in downtown Dallas.