The Young and the Restless Bad Boy Billy Miller Heads to Castle

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The Young and the Restless star Billy "Killer" Miller has snared a guest star spot on ABC’s Castle. According to CBS Soaps In Depth, Miller will play Wall Street banker, Mickey Gerhardt, who has a short fuse and is in the middle of a hostage crisis. Look for Miller’s episode to air in October.

Castle’s sixth season begins Sept. 23 at 10 pm EST on ABC.