The One-Armed Wolfman!
One of several phony monsters I de-bunked as a youth when I travelled around with a group of teenagers and went by the name of Li'l Beardie. Ah, those were swell times to be sure. I remember this one turned out to be Cousin Eldridge. The case was clinched when I found out Eldridge only had one arm. the motive? Good old-fashioned greed. Gets 'em every time.