The Mauthausen Memorial Committee says Hans Marsalek, a Nazi resister who helped document the history of the former Nazi concentration camp, has died.
The committee says Marsalek died on Friday at age 97.
Marsalek was arrested and sent to Mauthausen, in Upper Austria, in 1942 for his opposition to the Nazis and survived there until the Allies liberated the camp in 1945.
He was a leading member of the committee, which turned the camp into a memorial to the crimes committed by the Hitler regime.
The Nazis shot, gassed, beat or worked to death about half the 200,000 inmates in the main camp or its affiliates. About 200,000 people visit Mauthausen each year.