Stu Ungar was a legendary poker player who was widely considered to be one of the greatest players of all time. He won three World Series of Poker Main Events and two World Poker Tour titles, making him one of the most successful players in the history of the game. He was also known for his aggressive playing style and his ability to read opponents. His nickname was 'The Kid' due to his youthful appearance and demeanor. He passed away in 1998 at the age of 45.