WWMT Family members of a Michigan woman missing for nearly two decades say they working with authorities on a new lead.Tammie Jane Briley was last seen in September of 2000.The 37-year-old’s boyfriend told investigators she demanded to get out of his car during an argument as he was driving along I-94 near Battle Creek.“She was last seen crossing the Interstate from the westbound lane to the eastbound lane,” according to a report from the FBI .Briley’s boyfriend was questioned, but her body was never found . . .