Driving a Ferrari 512 in an Interserie race at the Nürburgring, he survived a fiery start collision that ended in the pit lane next to a fire engine.

He died in the 1981 1000 km Nürburgring in his Porsche 908 Turbo, racing with his longtime friend Siegfried Brunn.

Before the event, Müller stated that he would retire from motorsports after the end of the race.

On lap 17 of the race, Müller crashed while attempting to avoid another driver who had spun in front of him at Kesselchen.

He collided heavily with an earth bank and then hit a previously retired car driven by Bobby Rahal, causing a large explosion and fire.