By Police1 Staff

CORSICANA, Texas — The son of an officer who was killed in the July 2016 ambush in Dallas died from an apparent self-inflicted gunshot wound Monday.

KDFW reports that 19-year-old William Thompson, son of Dallas Area Rapid Transit Officer Brent Thompson, was found dead by Corsicana police at a park. Police said Thompson called 911 early Monday morning and told them that he was planning to kill himself.

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Officers were able to track Thompson down, but he shot himself as police were approaching him, according to the report. No suicide note was found.

Brent Thompson was one of five officers who were killed in a deadly ambush in downtown Dallas on July 7, 2016.

Police said William Thompson’s death is under investigation.