The River's Paul Blackthorne to Guest-Star on CSI

Paul Blackthorne is venturing from ABC's The Riverto CBS' CSI.

The actor has been cast as a charismatic college professor who teaches a class on the nature of celebrities, Entertainment Weeklyreports. His character, Tom, will become the focus of an investigation when one of his protégés ends up dead.

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Blackthorne currently stars on The River as TV producer Clark Quietly. He was recently cast in The CW's Arrow pilot, a modern retelling of DC hero Green Arrow's legendary adventures, where he'll play a detective and father of Laurel (Katie Cassidy), the love interest of the Green Arrow's alter-ego Oliver Queen (Stephen Amell).