Daniel "Danny" Williams (portrayed by Scott Caan) is the second main character of the CBS police drama series Hawaii Five-0. He is a police Detective who originally worked in New Jersey but moved to Hawaii to remain close to his daughter, Grace Williams. He is also currently a member of the Five-0 Task Force and the partner of Lieutenant Commander Steve McGarrett. Danny grew up on the mainland, in New Jersey. His family consists of his younger brother, Matt Williams, his sisters and parents. Like the rest of Five-0, Danny is shown to have complete loyalty to Steve.