Corsicana, TX – The son of a DART Officer who was killed in a 2016 Dallas ambush was found dead early Monday morning, police said.
Authorities said William Thompson, 19, called 911 at approximately 4 am on Monday. He said he planned to kill himself, and did not provide a reason, the Corsicana Daily Sun reported.
Corsicana police located Thompson at a park, but the teen hung up on the dispatcher and shot himself as officers approached, investigators said.
No motive for his apparent suicide has been released, and investigators said Thompson did not have a note with him when he died.
An autopsy will be conducted, and an investigation into Thompson’s death is ongoing, police said.
Thompson was the son of Dallas Area Rapid Transit (DART) Officer Brent Thompson, who was murdered during a July 7, 2016 sniper attack at a Black Lives Matter march in downtown Dallas.
The assassin, 25-year-old Micah Xavier Johnson, opened fire on police, killing Officer Thompson and four other officers during the ambush. Nine additional officers and two civilians were wounded.
Johnson then took refuge in a parking garage, resulting in a standoff with police.
During the standoff, Johnson told authorities that “he was upset at white people,” Dallas Police Chief David O. Brown told the New York Times. “The suspect stated he wanted to kill white people, especially white officers.”
Johnson was ultimately killed by an explosive device that was delivered by a remote-controlled robot, Chief Brown said.
The DART police department was established in 1989, and Officer Thompson joined their ranks in 2009, the Washington Post reported.
Just weeks before his murder, Officer Thompson married another officer from the same department.
His death marked the first time a DART officer had been killed in the line of duty.