A 68-year-old Dunnellon man was killed and an Ocala woman was seriously injured after the man's motorcycle rear-ended the woman's sedan on U.S. Highway 41 on Tuesday, marking at least the 13th fatal motorcycle accident in Marion County this year and the second in the past week. Read more: Motorcyclist killed in crash on U.S. 41, marking 13th rider death this year in Marion County