He teamed up again with Wayne in 'The Sons of Katie Elder' (1965), somewhat unconvincingly cast as brothers.

A story he wrote became The Sons of Katie Elder (1965), and was his last film.

Hopper acted in mainstream films including The Sons of Katie Elder (1965) and True Grit (1969).

He played the sheriff in The Sons of Katie Elder.

The Sons of Katie Elder (1965)

He would team again with Wayne in The Sons of Katie Elder (1965), cast as brothers.

This movie is based on the Hollywood movie Four Brothers, which in turn was loosely based on the American western The Sons of Katie Elder.

He was also cast in a John Wayne film The Sons of Katie Elder and it seemed his career was in good shape.

The Sons of Katie Elder (1966)

The 2005 film Four Brothers was loosely based on The Sons of Katie Elder.