At the beginning of the Prague uprising Kříž was arrested by insurgents and after the end of World War II he was accused of collaboration with the Germans and subsequently sentenced to death by a people's court in Prague. He was hanged at Pankrác Prison in March 1947, together with fellow Nazi collaborators Rudolf Novák (of "Arijský boj") and Antonín J. Kožíšek. Kříž's last words were: "Ať žije národ, ať zhyne bolševismus!" ("Long live the nation, may Bolshevism perish!")