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For 13 years, Tim Donaghy was a top referee in the National Basketball Association (NBA), making almost $300,000 a year. However, during the last four years of his career, he led a secret life, committing a personal foul by betting on NBA games, including some he officiated. Donaghy admitted that he had an addiction to gambling, which began with golf and card games, and eventually escalated to betting on athletic contests, including the NBA. He claimed to have won about 75% of his bets, and up to 80% of the time, he knew the outcome of games due to his insider information. Donaghy believed that his betting didn't influence his refereeing, and the FBI investigation concluded that he did not fix games in the NBA. He revealed that he would often receive information from NBA officials, including pre-game instructions, which helped him make informed betting decisions. Donaghy also claimed that certain referees would let their personal biases influence their calls, which he used to his advantage to predict game outcomes. He even used inside information to bet on specific players, like Kobe Bryant, who was due for favorable treatment due to a previous complaint about missed foul calls. While some former referees, like Mike Mathis, felt betrayed, Donaghy's cooperation with the FBI investigation led to his reduced sentence.