{Manhattan, New York}...Tuesday, 42 year old David Albert Mitchell pleaded not guilty in Manhattan to sexually assaulting a 73 year old birdwatcher in Central Park in New York on September 12th. West Virginia State Police Sgt. C.F. Kane of the Welch detachment in McDowell County says investigators considered Mitchell a suspect in the disappearance of Barbara Flake, who was last seen in 2002. Her remains were discovered in 2004, and the case was classified as a homicide, but there was never enough information or probable cause to make an arrest.