Biography
From Wikipedia, the free encyclopedia. James Gordon MacArthur (December 8, 1937 – October 28, 2010) was an American actor best known for the role of Danny "Danno" Williams, the reliable second-in-command of the fictional Hawaiian State Police squad Hawaii Five-O. Description above from the Wikipedia article James MacArthur, licensed under CC-BY-SA, full list of contributors on Wikipedia.
Known For

Hang 'em High
The Preacher

The Bedford Incident
Ensign Ralston, U.S.N.

Spencer's Mountain
Clayboy Spencer

The Interns
Dr. Lew Worship

The Angry Breed
Deek Stacey

The Love-Ins
Larry Osborne

The Truth About Spring
William Ashton

The Light in the Forest
Johnny Butler / True Son

The Night the Bridge Fell...
Cal Miller

Battle of the Bulge
Lt. Weaver