Hey buddy, sorry to hear that. Willie Mac is considered one of the classiest guys to every play in SF. I hope that was the wrong address and it wasn't him or someone at his address. That's horrible. I know he now walks with the aid of specially made crutches or a cane, but I believe he still signs. He still comes out to certain Giants games too. PM me with the address with you can and I'll see if it's consistent with where he usually signs.
Take it easy man