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Chip Johannessen has been tapped as executive producer/ showrunner on CBS' upcoming drama series "Moonlight."

He replaces David Greenwalt, who left the series last week for personal, health reasons (HR 7/27).

"Moonlight," from Warner Bros. TV and Silver Pictures TV, centers on a private investigator (Alex O'Loughlin) who is a vampire.

Johannessen's credits include ABC's "Empire" and Fox's "Dark Angel" and "Millennium."