Why yuri gagarin died?

On the morning of 27 March 1968 Gagarin took off from Chkalovsky airfield in a two-seat MiG-15UTI with Vladimir Seryogin, a decorated test pilot and commander of his training regiment, in the other seat. It was a short currency sortie of the kind military pilots fly to stay qualified. Minutes in, Gagarin reported that the exercise was complete and that he was returning to base, and then went silent. The wreckage was found in woodland near the village of Novosyolovo, in the Vladimir region; both pilots had died on impact, and the engine had been running when the aircraft struck the ground.

The state commission worked with poor evidence: no recorder of any modern sort, a shattered airframe scattered across frozen forest, and contradictory radar and weather data. Its conclusion, classified for decades, was that the crew made a sudden manoeuvre, probably to avoid something ahead of them, and that the trainer entered a spin it could not be recovered from in the altitude available. The cloud base that day was low, leaving seconds between breaking into clear air and the treetops.

Secrecy bred theories: a weather balloon, a birdstrike, an open cockpit vent, alcohol — the autopsies found none. The most durable account came from cosmonaut Alexei Leonov, who argued, working from the declassified file, that an unauthorised supersonic fighter passed close enough to flip the MiG into its spin with wake turbulence. Russian officialdom has never formally adopted that version, and with the fragments long since dispersed the question is unlikely ever to be settled. What is certain is that Gagarin's death owed nothing to spaceflight.