Apparently, some kinds of cocaine use result in overheating, so the perps strip down. The cannibalism is an oddity, and if he took multiple shots while still eating, I'm not ruling out George Romero's involvement.
I found another version of this story and it's said the drug was LSD. I wonder what Timothy Leary would think about his wonder drug.
"Inequality is a false notion propagated by those who are made to feel guilty for what they have by those who are jealous for what they don't"-Former MTV Host Kennedy