On May 9, 1945, Wilhelm Keitel had to sign the unconditional surrender of Nazi Germany at Soviet headquarters in Berlin.
He was subsequently arrested and tried at the International Military Tribunal in Nuremberg, Germany. Keitel was sentenced to death and hanged at the Nuremberg Prison in April 1946. According to Roger Dooley, it took twenty-five minutes for Keitel to die on the gallows.
In real-world history, Wilhelm Keitel was hanged on October 16, 1946.