The last-known member of the circle of plotters who failed in a 1944 attempt to assassinate Adolf Hitler has died, said a family employee. Family cook Margrith Schmitz confirmed a report Friday in Germany's Frankfurter Allgmeine Zeitung newspaper that Philipp Freiherr von Boeselager died May 1. He was 90 years old. Von Boeselager was one of a group of officers who tried to kill Hitler on July 20, 1944, supplying the explosives for the attack. Their leader, Col. Claus Graf Schenk von Stauffenberg, and others were captured and executed shortly after the briefcase bomb plot failed. Boeselager's name was never divulged and he survived.