Also signed on for guest spots are rapper Nelly, actor Scott Wolf, former NFL star Marshall Faulk and actress Julia Ormond.
People said the episode will follow a story line in which individuals named Mac Taylor, the name of the series' lead character, are targeted by a killer.
The magazine said Daughtry will play a character named Machiavelli Taylor, while Willis and Wolf will be featured as other Mac Taylors.
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