John Fujima was the agent in charge of the FBI's Miami field office. He and his team of agents were spearheading an inter-departmental investigation into the Aryan Brotherhood outfit running drugs in the city when their informant, Alonzo Stevens, gave them up in the hopes of saving his wife, who had been kidnapped by the group; as a result, Fujima's team of agents were killed and his investigation was left floundering. He subsequently approached Crockett, Tubbs and Castillo, who initially discovered the breakdown of his case (Alonzo had been their informant before they'd turned him over to the FBI, and it was Crockett whom he had contacted to confess). He asked them for their help in restarting the case; he knew from Alonzo's information that there was another leak somewhere, and as Castil