<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2018) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (January 2018) (Learn how and when to remove this template message) </Td> </Tr> <P> James Gordon MacArthur (December 8, 1937--October 28, 2010) was an American actor best known for the role of Danny "Dano" Williams, the reliable second - in - command of the fictional Hawaiian State Police squad in the long - running television series Hawaii Five - O . </P> <P> Born in Los Angeles, MacArthur was the adopted son of playwright Charles MacArthur, and his wife, actress Helen Hayes . He grew up in Nyack, New York, along with the MacArthurs' biological daughter, Mary . He was educated at Allen - Stevenson School in New York, and later at the Solebury School in New Hope, Pennsylvania, where he starred in basketball, football and baseball . </P>

Who played the original danno on the original hawaii five o