MH370 Another book has appeared weighing in on the disappearance of Malaysian Airlines Flight 370, suggesting that its captain Zaharie Ahmad Shah had committed suicide and mass murder.

The authors Geoff Taylor and Ewan Wilson claim to have reached this conclusion after interviewing family members and friends of the pilot, and after ruling out other possibilities.

“Though a process of elimination we were left with the uncomfortable and very tragic likelihood that Zaharie, because of some personality disorder, depression or emotional breakdown killed himself and everyone on the aircraft deliberately,” Wilson said in a statement today.

The new book 'Goodnight Malaysian 370' is just the latest of several books and films on the mystery, that had put forward a range of theories of what could have happened to the missing aircraft ,including accidental shooting and hijacking.

Some of these works have been criticised as insensitive attempts to make money out of the tragedy, including by Joint Agency Coordination Centre (JACC) chief Angus Houston who headed the search effort.

The e-book is slated to be released on Amazon Kindle on Aug 4. Wilson was a pilot and the former chief executive of two airlines, while Taylor is the editor of the New Zealand-based Waikato Times.

Wilson had also served a jail term after being convicted on four charges of fraud in 1998,  allegedly committed when he was setting up the now-defunct airline Kiwi Air.

MH370 was carrying up to 239 persons on a flight from Kuala Lumpur to Beijing on March 8, but was mysteriously diverted just as it left Malaysian airspace.

It is now believed to have crashed in the south Indian Ocean. A bathymetric survey is being carried out by two vessels at the suspected crash site to pave the way for a renewed search effort in early September.

The two authors claimed that Zaharie ( left ) had probably locked his co-pilot Fariq Abdul Hamid out of the cockpit before depressurising the aircraft, shutting off all communications, and changing his aircraft’s course.

“We were able to completely rule out any possibility of catastrophic structural failure, rapid depressurisation, electrical failure, fire or being shot down as possible causes for MH370's loss,” Wilson said in the statement.

Zaharie purportedly made a total of eight course changes before allowing the Boeing 777-200ER aircraft’s autopilot to takeover the rest of the journey, while Zaharie himself had supposedly died of hypoxia (deprivation of oxygen) with the rest of the passengers and crew, or re-pressurised the aircraft to continue guiding it.

They claimed that Zaharie had taken pride in his technical prowess, and probably had satisfaction in making the aircraft “virtually impossible to find”.

Wilson added that other causes such as hijacking or an accidental and slow depressurisation cannot be ruled out, but deemed them to be “extremely unlikely”.