BLUEFIELD, W.Va. (AP) - The FBI plans to investigate the death of a Mercer County woman who died at a Charleston hospital several days after being briefly held at the Bluefield City Jail.Supervisory Special Agent Chris Courtright told the Bluefield Daily Telegraph there's no timeline for when the investigation will end.Bluefield resident Connie Hambrick was arrested by police June 4 on an outstanding warrant from Tazewell County, Virginia.