Final answer:
The last documented use of poison gas in the Holocaust occurred at Stutthof on May 9, 1945. Auschwitz was the largest death camp, and the Holocaust ended with the liberation of the camps and the conclusion of World War II.
Step-by-step explanation:
The last documented murder using poison gas during the Holocaust took place at Stutthof on May 9, 1945. This was after the peak of the Holocaust killing period, which lasted from early 1942 until late summer of 1943. Extermination camps were explicitly designed for mass murder, with Zyklon B as the primary chemical used in the gas chambers. Auschwitz, the largest death camp, was responsible for the deaths of approximately 1.1 million people. As the war came to an end, the Holocaust did too, with the liberation of the camps by the Allied forces and the Soviet army.