Channel 285 and it is solved.
Results: Solved. On February 12, 1997, John David O'Meara, a man who reportedly has no ties to the school that Nancy was attending or the Union, was arrested and charged with her murder while serving time in a Polk County, Florida jail for an unrelated crime. An informant told the Maryland National Resources Police that O'Meara told him that he had killed a girl, and when the informant asked who the girl was, O'Meara said "the one on Unsolved Mysteries." O'Meara told police met Nancy at a bar on the night she vanished. He claimed that he took her out on a boat and that she fell over accidentally and drowned. However, when he went on trial for Nancy's murder, a jury did not believe him, and he was convicted of second degree murder and sentenced to fifteen years in prison.
Interesting seeing footage from the area and the interviews.