I guess so, there are some bastards that got away clean even with the death penalty, a little list of those.
Hermann Goering (Commander in chief of the Luftwaffe during WW2 and number two behind Adolf Hitler himself, co-fonder of the Waffen SS and the Gestapo, responsible of countless atrocities during the war, including bombing campaigns on Civilian Targets and Crimes against Humanity, was sentenced to death in Nuremberg, got away clean by commiting suicide with poison)
Josef Stalin (Head of the Soviet Union and Commander in chief of the Red Army, co-fonder of the Pravda Newspaper, responsible of the Katyn Massacre in Poland, not even the Russian Siberian Gulags in Siberia could get him to stop his ways, got multiple of his own commanders executed for just doing their jobs, got Leo Trotsky executed in Mexico, head of a cruel dictatorship probably even worst than the Nazis themselves, overlooked the multiple series of rapes caused by the head of his secret police (NKVD later known as KGB) Lavrenti Beria, refused his own son s freedom after he was captured as a Soviet Soldier by the Waffen SS, Blackmailed Finland and Eastern Europe, sponsored multiple coup d etats, spying activities and political assassination, and the list of what he did goes on...Got away clean when he died of a heart attack in 1953 still head of the Soviet Union later disowned by his own Communist Party and replaced by Nikita Krushchev)
Adolf Hitler (No introduction needed, possibly one of the worst dictators in history in Germany responsible for WW2 and the Hollocaust, got away clean by commiting suicide in his bunker while the Soviet troops were storming Berlin, the British and American troops in the meantime had stormed western Germany)
Heinrich Himmler (Co-Fonder of the Waffen SS and Gestapo, mostly head of the Concentration Camps, head of the Waffen SS and Gestapo, got away clean by commiting suicide after beeing captured by American troops)
These are only a few of what I could find for some of the worst bastards in history that were never punished in the end, when they commited suicide but were never judged properly its as good as if they got away clean with their crimes.