ST. LOUIS COUNTY, MO. — Authorities on Monday, Aug. 24, 2026, identified the motorcyclist who died in a crash Friday evening in the 9900 block of Mackenzie Road as 21-year-old Zachary Mathews, of the 6200 block of Dexter Drive in St. Louis.St. Louis County police said officers from the South County Precinct responded at approximately 6:30 p.m. Friday, Aug. 21, 2026, to a call for service for a motor vehicle crash. Officers found a sedan and a motorcycle at the scene.The driver of the motor...