Mr Morris said the cause of death was suffocation with a secondary cause of an overdose with painkillers.

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Unicef also identified road accidents, burns, falls, animal bites, electrocution and suffocation as other causes of serious injury and death.

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The cause of death remains unknown, but experts agreed it was either from suffocation or poisoning, she said.

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He said because of the decomposition of the body the informed cause of death was unascertainable but taking into account the case as a whole, some kind of suffocation or chest compression was most likely.

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