Patrick Dempsey Joins ‘Dexter’ Prequel ‘Original Sin’

The upcoming Dexter prequel series Original Sin has locked up another major star for its cast.

Patrick Dempsey, the veteran of Grey’s Anatomy, has joined the Paramount+ Showtime show as a series regular.

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Dempsey joins Christian Slater in the series, with Slater playing protagonist (or antagonist?) Harry Morgan. Dempsey will portray Aaron Spencer, the captain of the Miami Metro Homicide who has a decades-long relationship with Slater’s character Morgan.

“Patrick Dempsey is a beloved actor who is internationally known for the iconic characters he has played and his performances,” said Chris McCarthy, Paramount Global co-CEO and president/CEO, Showtime & MTV Entertainment Studios. “We are thrilled to have him join our all-star cast of Dexter: Original Sin, the highly anticipated origin story of the franchise.”

Original Sin is set in 1991 and follows Dexter Morgan (played by Patrick Gibson) as he becomes an avenging serial killer under the guidance and code of his father, Harry Morgan. It was originally ordered last year as Dexter: Origins.

The show also staffed up the other members of its police department cast earlier this month.

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