Sergei Golev, 44, suffered the attack in the cockpit and died despite all attempts at resuscitation - even a cardiologist, who was among passengers on the flight, failed to revive him.
Fortunately the 239 passengers onboard the UTair Boeing 757 landed safely in Novosibirsk despite Golev's death.
Safe landing: 239 passengers were taken to the final destination of Novosibirisk airport despite Golev's death.The captain attempted an emergency landing in the Chinese city of Chengdu, but abandoned it because Golev died before the jet touched down.
Senior investigator Anastasia Utochkina told Life News: 'The co-pilot died at 12.25am, Novosibirsk Time (5.25pm GMT), three hours after takeoff.
'The captain made a decision to descend, while the crew called over the tannoy for a female physician who happened to be among the passengers.