Thomas "Fatty" Walsh was a mobster associated with Dutch Schultz and Charles "Lucky" Luciano. He was suspected to be involved in the 1928 gangland slaying of Arnold Rothstein.
At a loud party on the 13th floor of the Biltmore Hotel, a gangster named Thomas "Fatty" Walsh was shot and killed by another gangster. That murder yielded a lot of ghost rumors over the years including the Vice City version. Along with the indication, Thomas Walsh may possibly be indicated in a mafia portrait at Marco's Bistro, while some have speculated that he may be present in the game, whereas researching game files eradicates any possibility.
Keeping in view the mentioned facts, he may be as well involved in the Vice City Mafia along with the Forelli Family, but it is unknown as to whether he is still alive or not, even if Thomas is currently active, it is uncertain of how he was involved in the crimes, perplexing his existence in the game.