Another Stealth Vampire story found

[alexxkay]

...making a total of four that I know of. "Halley's Passing", by Michael McDowell, 1987. It's sort of an inverse police procedural, following a very methodical serial killer on his rounds, as he does his best to move around randomly, avoiding police attention, and killing someone at random every night. At the end of the story, he sees Halley's Comet passing, and reminisces on the several previous times he's seen it, and the good old days when he didn't need to move so often, and could do more than just lick a bit of blood of his fingers every night...