Vladislav Volkov

Vladislav Nikolayevich Volkov was a Soviet cosmonaut who flew on the Soyuz 7 and Soyuz 11 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.

Text from Wikipedia, CC BY-SA 4.0

Image: USSR Post · Public domain