DALLAS, Texas – The City of Dallas is set to honor its fallen first responders with the installation of memorial street toppers across the city. The initiative will be officially launched in a ceremony at Dallas City Hall on October 24, 2024, at 9 a.m., according to a press release from the city.Following the ceremony, the first two street toppers will be unveiled at intersections honoring fallen Dallas Police Department officer William H. Riddell and Dallas Fire-Rescue officer John Dardeman. Officer Riddell, age 55, was shot and killed on June 17, 1892, while serving a warrant, and Firefighter Dardeman, age…