Two of the world's most famous sideburns are headed to CSI.

Entertainment Weekly confirms that Jason Priestley has booked a role on the drama's 300th episode, which will air October 23 and also feature the return of former lead Marg Helgenberger as Catherine Willows.

Look for the beloved Beverly Hills, 90210 star to come on board as a casino mogul who is looking to regain his empire after a scandal turned him into a recluse.

But while Priestley and Helgenberger are in, George Eads is out.

The long-time cast member has been suspended from the series after clashing with a writer on set and will not be around for Episode 300.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.