A DEADLY plane crash may have been caused when a passenger accidentally knocked-out the pilot while taking a selfie.
The new theory says a snap happy flyer caused the death smash killing a Brit millionaire, his family and the pilot.
The de Havilland DHC-2 Beaver sight-seeing plane flew off course, despite clear conditions, and nosedived into the Hawkesbury River on New Year’s Eve last year.
Richard Cousins, 58 and fiancée Emma Bowden died along with his two sons, William, 25, and Edward, 23, and Emma’s daughter Heather, 11.
A new owner of Sydney Seaplanes Jerry Schwartz said: "The investigation has shown that safety is good and it’s actually believed to not be pilot error.
"The current belief is the passenger at the front actually knocked out the pilot."
Mr Cousins, the boss of catering giant Compass, left most of his £41 million fortune to Oxfam.
The businessman of Hyde Heath, Bucks, was due to retire as CEO of Compass, the world’s biggest catering firm, in March.
He and Emma, OK! magazine’s art editor, planned to marry in July.
The Australian reports the passenger may have accidentally struck the pilot in the head while moving his arm to take photos.
Sydney Seaplanes managing director Aaron Shaw added: "Something definitely happened to the pilot to incapacitate him."
A report into the crash is due to be handed down by the Australian Transport Safety Bureau next year.
Preliminary reports by the ATSB found there were no obvious mechanical defects or fuel contamination on the aircraft,
Pilot Gareth Morgan, 44, was described as well-qualified and experienced.
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The family were on a “fly-dine” sightseeing trip and heading to Rose Bay in Sydney Harbour when the plane hit the water.
An inquest is set to be held in the UK.
Earlier this year, it was determined the passengers died from head injuries or drowning or a combination of both.
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