In Fright Night (1985) Billy Cole is described as Jerry Dandrige's "day guard". During the movie Charlie mentioned Billy wasn't a vampire because Billy was seen walking around in the sunlight.
As part of the climax, Peter Vincent shoots Billy in the head and several other places, but Billy doesn't stop until Charlie stakes him in the heart which causes Billy to melt, turn to sand and then explode.
What exactly was Billy if not a vampire? Some kind of golem?