Daggett was a janitor at a hospital. Lonely and paranoid, he bought home corpses from the hospital and set them up in a macabre birthday celebration in his bomb shelter. He then committed suicide by overdosing on horse tranquilizers. Each year on February 29 following his death, he would capture and kill anyone in the house to continue his "celebration," giving him the nickname the "Leap Year Ghost." This combined with the spirits of the corpses he stole from the hospital, who remain in the house as a Death Echo, give Morton House its reputation as the most haunted house in America.
Daggett captures first Corbett and then Sam. He kills Corbett, but Dean rescues Sam. Corbett becomes a Death Echo until Ed Zeddmore uses their emotional connection to free him. Corbett is then able to vanquish Freeman Daggett.