Months later, however, von Kleist was approached again by von Stauffenberg to take part in what would become known as the July 20 plot for the day in 1944 that the assassination was attempted which was brought to the big screen in 2008 in "Valkyrie, " starring Tom Cruise as von Stauffenberg.

NPR: Last Survivor Of Plot To Kill Hitler Dies At 90

The meeting did not come off, but months later he played a key role in what became known as the 20 July plot.

BBC: Hitler assassination plotter Von Kleist dies