Towards the end of the series, Crockett's role in the investigations decreased and he began to burn out. While Davies was away on a European tour, Crockett was shot in the line of duty by the girlfriend of a drug dealer he shot, and was left in hospital fighting for his life, but he would recover. However, after Caitlin returned from her tour and was reunited with Crockett, she was killed by Hackman (whom Crockett had erroneously gotten released from the death row two years earlier). Upon learning that she was six weeks pregnant with their child, Crockett went into a drunken rage, tracked down Hackman and killed him in cold blood. He would never fully recover from Davies' death. After getting caught in a boat explosion while undercover, Crockett suffered amnesia and briefly adopted his cover of Sonny Burnett, starting working for Miami drug cartels. However, after he survived a car bomb hit on his life, his memory returned, and horrified at what he had become, and seeing no alternative, he turned himself in to his squad. However, having lost the trust of his friends and facing the risk of being to jail for the crimes committed as Burnett, Crockett escaped from custody and took down the rest of the cartel, saving Tubbs' life in process. Though it helped him earn back some of the trust he had lost, he still had to answer for his crimes, and was ordered to take time off and would have to undergo questioning and psychiatrical evaluations. Though he would be later exonerated and his friends slowly began to trust him again, he was still left with the mental scarring of his brief life as Burnett.