John Wayne and Jack Elam in Rio Lobo (1970)

Jennifer O'Neill and Jorge Rivero in Rio Lobo (1970)

John Wayne, Jack Elam, Jennifer O'Neill, and Jorge Rivero in Rio Lobo (1970)

John Wayne, Jack Elam, and Jorge Rivero in Rio Lobo (1970)

John Wayne and Howard Hawks in Rio Lobo (1970)

John Wayne, Don 'Red' Barry, and Jorge Rivero in Rio Lobo (1970)

John Wayne and Victor French in Rio Lobo (1970)

John Wayne and his son, Ethan, on location for "Rio Lobo," Cinema Center 1970.

John Wayne and Bill Williams in Rio Lobo (1970)

John Wayne and Christopher Mitchum in Rio Lobo (1970)

John Wayne and Jennifer O'Neill in Rio Lobo (1970)

John Wayne, Christopher Mitchum, and Jorge Rivero in Rio Lobo (1970)

John Wayne, Jack Elam, and Christopher Mitchum in Rio Lobo (1970)