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Police failed to take full toxicology test samples from triple killer Valdo Calocane (pictured) that could have led to him being handed a stiffer sentence - but they did test his victims.
The mother, from High Wycombe, Bucks, told the Telegraph she knows the 'agony' the parents of Grace O'Malley Kumar and Barnaby Webber have gone through, after losing Libby in 2019.
In a statement, the watchdog said it had launched an independent investigation after requesting further information from Leicestershire Police.
Thug Humphrey Burke, 30, was sentenced to an indefinite hospital order for kicking prison van attendant Lorraine Barwell to death - but is now roaming free just 24 months later
Valdo Calocane killed nineteen-year-old university students Grace O'Malley Kumar and Barnaby Webber, as well as school caretaker Ian Coates in the early hours of June 13 last year.