The Russian passenger plane crash that killed 50 people, including Briton Donna Bull, was caused by pilot error, investigators said.
Russia's aviation safety watchdog said the pilots of the Boeing 737 somehow let the plane become too slow at a low altitude, resulting in a diving crash that killed all on board.
The Interstate Aviation Committee said the plane's engines and other systems were working fine until the moment it hit the ground.
The crew put the plane's engines on maximum power, raising the nose up at a sharp angle, causing a quick loss of speed - they then tried to gain speed by taking the plane into a dive, but hit the ground at a near-vertical angle.
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The man, who was in his 30s, has not been identified, while several other people are believed to have suffered serious injuries.
The Olympian was one of several sports stars who opened up to the prince during an event for his mental health charity Heads Together.
There will be sunny spells, with temperatures peaking at 23 Celsius (73F). However, Northern Ireland will experience frequent showers.