He seems to be following the players and sending them ambiguous messages.
Not much, if anything is known about this character. Not even Joe the Trader, when questioned, seemed to know about him. The little bit that players know of him has been gathered from messages that he has left them, often written in the blood of the undead. One thing is for sure, he is quite stealthy. The messages that they players have received so far are as follows:
“I couldn’t let you die so quickly” Under this message was the head of a large zombie.