POLK COUNTY, Iowa- The Polk County Sheriff's Office says a motorcyclist has died after a crash with a car this morning in Grimes. Authorities say 25-year old Michael Fiori was traveling on SE Gateway Drive in Grimes, when he collided with a car after 8 o'clock. The Sheriff's Office says Fiori was transported to Iowa Methodist Medical Center in Des Moines, where he died. The driver of the car was not hurt.