Warrick Tennyson was a career criminal and explosives expert who was hired in 1997 to build and plant the bomb that killed Trudy Monk. Six years later, Tennyson was dying of heart and kidney failure, possibly attributable to cancer. After being arrested, or turning himself in, he was questioned extensively by federal authorities while in hospital in New York City, in connection with racketeering activities he had been involved in. Dale Biederbeck told Adrian Monk where to find Tennyson, and Monk interrogated him. Tennyson confessed to his crime, and told Monk that he had been hired by a man whose name he didn't know and whose face he didn't see, but who had a six-fingered right hand.