Last night was Scott Ian's big moment to shine on The Walking Dead. Ian appeared as a carpet walker and eventually was made to waste after (slight spoiler alert) being impaled by Carl, the lead character. Ian mentioned in a recent interview that he got to keep the mask of his face that the makeup artists cast as a souvenir of his time on the show.
Here's a quick clip of Scott's cameo:
Ian also posted a few photos of him in full walker makeup: