(Town of Concord) A motorcyclist was killed Friday in Jefferson County. Authorities responded to County Highway E, just south of Interstate 94 in the Town of Concord just before 6am. The preliminary investigation indicates that the motorcycle was northbound on County E traveling at a high rate of speed when it left the roadway and struck a tree. The lone occupant on the motorcycle was pronounced dead at the scene. The Jefferson County Sheriff’s Office was assisted at the scene by Wisconsin State Patrol, Watertown PD, Jefferson County Emergency Communications and Jefferson County Medical Examiner. The incident is still being investigated by the Jefferson County Sheriff’s Office. Speed is considered to be a contributing factor in the crash.