Timothy Thornton, who in 2016 become the first CEO of St. Louis-based Greensfelder, Hemker & Gale, has died from injuries in a bicycle accident Sunday. He was 64.

According to local news reports, Thornton was biking on Missouri Route 100 on Sunday when he was struck by a westbound pickup truck. Thornton was taken to a local hospital where he was pronounced dead hours later. The driver of the pickup remained on scene and cooperated with officers.