All four died of asphyxia due to trauma following the accident on 21 January 2011.
He told the court she died of asphyxia due to compression of the neck.
Children under the age of 5 die from asphyxia at birth, sepsis, pneumonia, malaria and other causes.
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Mrs Williams claims Kevin was still alive at 16:00 on the day of the disaster and did not die from traumatic asphyxia.
Miss Manning died of asphyxia due to compression of the neck.
Post-mortem tests in India gave the cause of death as asphyxia due to vomiting, but a second autopsy in the UK failed to ascertain the cause.
Most of them died from blunt force trauma or injuries, but six of the children, all age 9, died due to asphyxia, according to the medical examiner.
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An inquest jury concluded later that he had died as the result of "positional asphyxiation" - a form of asphyxia which occurs when the position of someone's body prevents them from breathing adequately.
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Mrs Williams has waged a long campaign for a new inquest into her son's death, disputing traumatic asphyxia as the cause of his death and the verdict of accidental death by the coroner.
The two American medical examiners issued separate opinions agreeing with a Singaporean pathologist's original autopsy finding that Mr. Todd had died from "asphyxia due to hanging" after they reviewed three pathological reports at the request of Singaporean authorities, Mr. Tai said.
Dr Clive Holgate, a consultant pathologist from Plymouth's Derriford Hospital, said post-mortem and toxicology tests on Ms Bending's organs were carried out in India and the cause of death was given as asphyxia as a result of aspiration - a reaction in the lungs to vomiting.
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