26 April 2010,
From TVseriesFinale.com;

Plans for CBS’s remake of the classic Jack Lord series, Hawaii Five-O, are moving right along. Last month, it was announced that Alex O’Loughlin (Three Rivers) would be playing Detective Steve McGarrett and Daniel Dae Kim (Lost) would be playing Detective Chin Ho Kelly. Now, fellow TV veterans Scott Caan, Jean Smart, and James Marsters will be joining them on the big island for the CBS show pilot.

Caan, who you may recognize from Ocean’s Eleven and its sequels, will be playing McGarrett’s right hand man, Danny “Danno” Williams. In the original Hawaii Five-O, the character was played by James MacArthur. According to THR, in this new version, Danno is a former New Jersey cop who transfers to Hawaii to be closer to his seven-year-old daughter. He’s initially leery of his maverick boss but soon grows to appreciate his results.