Vassago Crowley is the owner of an occult bookstore. His psychiatrist was Dr. Henry Burkhart and he is reported as believing he is the son of the devil.
He apparently does not respect authority.
He is killed by Ackerman when the killer puts him on a Spanish donkey to get information from him.
Ackerman reveals that Crowley has a soundproofed room with video cameras an a child's bed, as well as a history of sexually assaulting boys.
Vassago is the name of a demon. Crowley was the last name of the occultist Aleister Crowley.