"Throughout my examinations I could find no evidence of injuries that would suggest an accidental cause of death such as a fall, " he said.

BBC: Stuart Hazell leaves his partner's house on 8 August 2012

The fire was thought to be accidental but the exact cause has not been found.

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In fact, according to the Centers for Disease Control, accidental drowning is the second-leading cause of death for children from 1-14.

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The government warns 2.7m accidents lead people to seek hospital treatment each year, and accidental injury is one of the leading cause of child death.

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Those bullets were designed to be accurate to minimise the risk of an accidental head shot - the most common cause of death or injury from a rubber bullet.

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Staffordshire Fire Service said investigators found the cause of the blaze in Garner Street was accidental.

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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.

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The cause is under investigation, although Mr Poots said he believed it was "accidental and not related to the fabric of the building itself".

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