Different guy, if you get through the boxes you will come out by a guy who is actually lying asleep on the floor. He can also be auto-killed but from experience I've found it better to take him out from a distance.
The Hellsing is in Dead City 1 after you and Bourbon get split up and just after you come across a Demon chowing down on some guys corpse, it's a bit awkward to get to so you are best off checking the wiki for that.
Cheers! I know the guy you're on about now.
What's with the auto kill anyway, is that a bug? It sounds like a pssst noise then they drop dead...