Question: What is the name of the American serial killer of the 19th century on which the 1974 psychological horror novel by Robert Bloch is based?
Sentence (from "Henry: Portrait of a Serial Killer"): It stars Michael Rooker as the nomadic killer Henry, Tom Towles as Otis, a prison buddy with whom Henry is living, and Tracy Arnold as Becky, Otis's sister.
Relevant evidence: No