An LDS Missionary from Fairfield has died after a hit-and-run accident near Donna, Texas. KSL reports that 20 year old Derek Jason Walker and  21-year-old Trevor Reinhold Strong of Utah were killed just after 7:30 p.m. Tuesday while riding their bikes while serving an LDS mission.  A third missionary, 19-year-old Zachary Todd Harris of Huntsville, Alabama, was taken to a nearby hospital. Police say the driver of the vehicle that hit the three men ran from the area on foot. He later turned himself into police. Exactly what happened in the collision remains under investigation. Meanwhile those who knew Derek Walker like Randy Jewett, Camas High School's athletic director, say hearing the news was difficult.  He and  family spokesman Mike Owsley say the news of the missionary's death has hit the town hard.