While Van Pelt relieves US Marshal Gorman protecting Justin DeGeorge, the key witness against drug baron Adrian Essex, she's knocked out and the witness murdered. His daughter Trina probably has crucial memories, but aunt Jody, a retired army nurse, shields her most hostile against Patrick. He helps the team overcome that and Essex's accomplice Eugene Boden's alibi. LaRoche was planning to grill Van Pelt in the arson investigation anyway. FBI agent Craig supports her and successfully proposes.