Watch Subhuman

"Subhuman," also marketed as "Shelf Life," is a Canadian film from 2004 that starts with a man hunting down two attractive girls into an alley, then beheading and incinerating one, before being struck by an oncoming vehicle. Following the man's, named Martin, odd advice, Ben and his lover Julie decide to take him back to their place, rather than to a hospital, so that he can recover from his injuries. While Martin believes that people are being preyed upon by blood-sucking vampires, he is also an alcoholic derelict with an addiction to drugs and whom had escaped from a sanitarium.