"Vladislav Nikolayevich Volkov (Russian: Владислав Николаевич Волков; 23 November 1935 – 30 June 1971) was a Soviet cosmonaut who flew on the Soyuz 7 and Soyuz 11 ...
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missions. The second mission terminated fatally. Volkov and the two other crew members were asphyxiated on reentry, the only three people to have died in outer space." - (en.wikipedia.org 08.05.2024)