Peter Weller Comes Aboard Dexter
Weller will appear in eight of the 12 episodes from the show's upcoming fifth season. He will play "a troubled Miami Metro police officer who gets caught up in an internal affairs investigation."
Season five is presently in production for its September 26 premiere.
An interesting connection is how John Lithgow was on Dexter in Season four and now Weller has joined the cast for Season five. These two actors went up against one another in the 1980s cult film The Adventures of Buckaroo Banzai Across the 8th Dimension.