The dad of Nottingham rampage victim Grace O’Malley-Kumar said a damning report into the care of Valdo Calocane was “devastating” to read. University students Grace and Barnaby Webber, both 19, and caretaker Ian Coates, 65, were stabbed to death in June last year. Paranoid schizophrenic Calocane, 32, had been repeatedly sectioned but then discharged by mental health teams.

One doctor warned three years before the knife attacks that the university student “could end up killing someone”. The psychiatrist said the triple killer’s mental illness was so severe he was worried for the safety of other people. But despite the damning assessment, Calocane was released back into the community a fortnight later.

A report into his dealings with mental health services highlighted a series of errors that left him free to roam the streets. It said risk assessments by Nottinghamshire Healthcare Foundation NHS Trust “minimised or omitted” key details of the serious risk he posed. The Care Quality Commission report also questioned how well the trust engaged with Calocane’s family, who had raised concerns.

In another error he was detained under the wrong legislation - which meant doctors were unable to treat him against his will. The families of the three victims are calling for a judge-led statutory public inquiry into the tragedy. Grace’s dad Dr Sanjoy Kumar said he was determined to ensure no other parent experiences the pain his family have gone through.

Speaking after th.