Thames Valley Police has called in the police watchdog to look at its handling of an unexplained death of a woman last year.
Caron Kiernan died aged 54 in Charlton-on-Otmoor, near Kidlington, on December 19, 2013.
The force was required to refer itself to the Independent Police Complaints Commission (IPCC) because Ms Kiernan had recent contact with the police before she died.
The date for an inquest into her death has not been set.
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