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Police still don't know how four-year-old Alexa-Marie died

Alexa-Marie Quinn. Credit: Hertfordshire Police.

A post mortem examination carried out on a four year-old girl who died last week has failed to find a cause of death.

Further tests will now be carried out on Alexa-Marie Quinn, who was from Hatfield.

Hertfordshire Police said it could take several weeks or even months before the results are known.

Alexa-Marie's father Carl Wheatley, 30, has been charged with her murder.