In the Next Generation episode "The First Duty" Robert Duncan McNeill plays a character called Nick Lacarno, who as part of Flight Squad caused an accident which resulted in the death of another cadet. He was dishonorably discharged for lying and trying to cover it up.
McNeill then went on to play Tom Paris in Star Trek: Voyager with a very similar background, but with some very small differences — like Tom was an actual Starfleet officer, whereas Nick was only a Cadet. So was Tom Paris' character based on Nick Locarno?