46-year-old Jack Moriarty of Argos was killed instantly after crashing into a fence post on his moped Saturday evening.
Emergency crews from both Marshall and Fulton counties were called to the 8700 block of 19th road around 7:30p.m.
They say Moriarty was headed eastbound when, for an unknown reason, he lost control of his moped.
Moriarty was not wearing a helmet.
A toxicology report is pending.