Maricopa County Superior Court says 24-year-old Aaron Homer, of Chandler, pleaded guilty to aggravated assault and was sentenced Monday.
The Arizona Republic reports 25-year-old Robert Maley once let his roommates suck his blood. But when Maley refused a second time on Oct. 4, he was stabbed.
Chandler police said Maley lived with Homer and his girlfriend.
Maley said the two men were into "vampire stuff."