Marshal Brady was one of the U.S. Marshals guarding Joey Arnello in the Season 1 episode Mob Rules. He was portrayed by actor Greg Collins.
Brady was under suspicion when Joey got sick because his supervisor had found $3,000 deposited into his wife's bank account. Brady denied any wrongdoing. However, House realized that Brady had been paid by Joey's brother Bill to provide him with better food while in custody, which inadvertently caused Joey's symptoms.