The Door County Sheriff’s Department continues to investigate what may have led a 74-year-old Green Bay man to drive off the end of the Washington Island Ferry dock last week. On Monday, the department released that David M. Whitton was the man recovered from the single-vehicle incident in Northport on October 10th. The Door County Sheriff's Department, the fire departments of Sister Bay/Liberty Grove, Egg Harbor, Ephraim, Baileys Harbor, Gibraltar, Washington Island, and Sturgeon Bay, the United States Coast Guard, Wisconsin Department of Natural Resources (DNR), Door County Emergency Services, and the Door County Dive Team, all responded after Whitton drove his sports-utility vehicle into the water at the end of the dock before 7:30 p.m. An autopsy of Whitton’s body was conducted on Monday, and the results are still pending.