"Lost" writer and executive producer Carlton Cuse announced on his Twitter account that William Atherton will guest star on the final season of the hit ABC show. Cuse did so in the form of a clue:

Damon and I are die hard fans of this impeckable actor who keeps the barr high and just signed to guest star on the show. Life is good!

The 62-year-old actor starred in both Die Hard and Die Hard 2, his character's name in Ghostbusters was Walter Peck, he played Dr. Barr in "Desperate Housewives" and starred in "Life."

The final season will kick-off in January.