Dr. Rex Colabro, a sports physician with an extremely high-profile client list, found himself out of his depth in "The Dead Pool". One of his future stars was Brian Morris, whose father, Benjamin, called Dr. Colabro in a panic upon learning that his son might face a drug test. Dr. Colabro cooperated with Becket and Castle's investigation fully, once they threatened to inform his clientele of the nature of the line of questioning, and the possible connection to the murder.