Bobby Diaz was a Metro-Dade Detective and partner of Eddie Trumbull. Young, ambitious, and hungry, both he and Eddie were planning to become Sergeants together when they were assigned to serve a warrant on a fugitive named De La Cruz. They brought in Senior Detectives James "Sonny" Crockett and Ricardo "Rico" Tubbs as backup, and Tubbs went up to the room where De La Cruz was staying. Trumbull was first through the door, but encountered a bomb set in the booby-trapped room, and while Diaz and Tubbs were injured, Trumbull was mortally wounded and died en route to the hospital. Diaz then vowed revenge against those responsible for Trumbull's death, and though shaken up by the events, he returned to work. Tubbs arrived in OCB and was pulling Vice case files for Onofrio Avila when Diaz and Tub