Aviation expert Christine Negroni has claimed the co-pilot of missing Malaysia Airlines Flight MH370 was the last person alive on board before it plunged into the sea

5th Annual MH370 Remembrance Event

MH370 has been missing since 2014 (Image: Getty)

The co-pilot of MH370 may have piloted alone for hours after everyone else on board perished, according to an aviation expert.

The final fate of the fatal flight, which vanished en route from Malaysia to China in 2014 with 239 passengers and crew aboard, remains shrouded in mystery.

Author Christine Negroni proposed that the tragic plane's downfall could have been triggered by a sudden depressurisation of the cabin, resulting in the death of everyone on board.

She speculates that the Boeing 777's captain Zaharie Ahmad Shah might have been taking a break at the time, leaving co-pilot Fariq Abdul Hamid in charge.

The abrupt oxygen deprivation would have killed all passengers and crew within 15 minutes, but Hamid was shielded from its worst effects in the cockpit.

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Relatives of the missing (Image: Getty)

However, Negroni theorises that while not dead, the co-pilot's oxygen-deprived brain led him to make a series of peculiar decisions while attempting a rescue mission.

Eventually, he would have been unable to prevent the final plunge into the sea, which investigators believe is somewhere in the Indian Ocean.

The author of 'The Crash Detectives: Investigating the World's Most Mysterious Air Disasters',said: "The plane starts heading south. Whatever that time period is, that's the period of time I believe he went unconscious.

"The oxygen available for the passengers was about 15 minutes, so the passengers were all dead, there's no chance they were resuscitated, they were dead long before that plane hit the water."

Negorni believes the cabin depressurised 38 minutes into the flight when it lost contact due to an electrical failure.

She added: "Nothing that this pilot did, after the plane experienced its issues, made sense.

"To me when a pilot does something that doesn't make sense, it is a very strong clue that the pilot is not sensible.

Malaysians Remember Flight MH370

People have never forgottoen (Image: Getty)

"And what makes a pilot insensible is hypoxia, not just once but repeatedly."

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Last week former air crash investigator Larry Vance suggested the crash was a 'murder-suicide'.

Vance said he was "certain" that either Captain Shah or Hamid stole the plane in what he termed a "criminal event".