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Joey is a wealthy, wisecracking, narcissistic psychopath with a habit of stabbing his gay lovers to death. Despite his psychological problems, he is a brilliant schemer, who delights in and excels at manipulating the legal system for his own benefit. He first appeared as a murder defendant who had hired Bobby Donnell's firm to represent him, while in his second appearance (again as a murder defendant) he chooses to represent himself, with Bobby appointed by the court as second chair. When he returns several years later, he is now a licensed attorney, who hires Bobby's firm to help him with his first murder trial--only for Bobby to discover that Joey's primary motivation in becoming a lawyer is to continue to manipulate the legal system for his own amusement.
Larroquette's final appearance as Joey was a cameo in the season six finale, in which Joey appears on the news to publicly hint that he may be the culprit behind the O'Malley shooting--a twist on the firm's infamous misdirection strategy known as "Plan B."