William Henry O'Brien, also known as Kunu Hank, was a member of the Ho-Chunk-gra (formerly Winnebago) Native American tribe. He and Rifleman star Chuck Conners played pro and semi-pro baseball with some California teams in the 1950s and 1960s.Some of his film credits include "One-Eyed Jacks," "The Professionals," "A Man Called Horse," and "The Car." His television credits include "Wild Wild West," "Petticoat Junction," "Rifleman," and "Branded."Originally from Black River Falls, WI, he returned there when he retired.