Capel is married to fellow Duke alumna Kanika Réale Blue, daughter of Daniel T. Blue, Jr. and Edna E. Blue.
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He began his coaching career serving as an assistant coach under his father, Jeff Capel II, at Old Dominion University for the 2000–2001 season.
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His father is basketball coach Jeff Capel II, former assistant coach for the Charlotte Bobcats and former head coach at Old Dominion University, and his younger brother Jason played basketball at Duke's biggest rival, the University of North Carolina at Chapel Hill and is currently head basketball coach at Appalachian State University.
William III of England | George III of the United Kingdom | Henry III of England | George III | Edward III of England | Henry III | Edward III | Jeff Beck | Charles III of Spain | William III | Loudon Wainwright III | WTA Tier III tournaments | Richard III of England | Benigno Aquino III | Jeff Koons | Jeff Foxworthy | Pope Alexander III | Jeff Buckley | Star Wars Episode III: Revenge of the Sith | Henry III of France | Jerry Jeff Walker | Gustav III of Sweden | Jeff Daniels | Shalmaneser III | Jeff Bezos | Alexander III of Russia | Albatros D.III | Frederick III | Rainier III, Prince of Monaco | Jeff Minter |