The inquiry into the attacks by paranoid schizophrenic Valdo Calocane heard that another former patient at the same NHS trust killed someone less than a year before the Nottingham stabbings19:12, 19 May 2026Updated 19:14, 19 May 2026An ex-mental health patient at the same NHS trust which treated Nottingham attacker Valdo Calocane killed someone less than a year before the incident, an inquiry has heard.‌The fatal incident in August 2022 was said to have involved someone who "previously had contact" with Nottinghamshire Healthcare NHS Foundation Trust's mental health services.‌Paul Devlin, chairman of the trust until December last year, admitted there was a "missed opportunity" to take steps that could have prevented Calocane's violent rampage, which left three dead. Calocane, who was under the care of the trust from 2020 until he was discharged in 2022, had a rucksack of weapons when he brutally stabbed students Barnaby Webber and Grace O'Malley-Kumar, both 19, and caretaker Ian Coates, 65, in the early hours of June 13, 2023.‌READ MORE: Nottingham killer's brother thought his violent messages were about suicideREAD MORE: Nottingham attacks killer Valdo Calocane was discharged because healthcare workers couldn't find himHe then attempted to murder three pedestrians in Nottingham city centre using a van he stole from Mr Coates. The inquiry, which is examining events leading up to Calocane's killings, heard on Tuesday that a separate, fatal attack was carried out in August 2022 by another former patient. They were not named, and the circumstances of the killing were not shared in evidence.James Weston, counsel to the inquiry, said: "From a board level, not enough was done in relation to this incident in August 2022." Mr Devlin said: "I accept that."‌Mr Weston added: "We're a few weeks before VC's (Valdo Calocane) discharge - when he was discharged from the trust to the GP. "We've got a case here that involves a former patient, and some issue about discharge, but no meaningful steps are being taken by the board at this stage. This was a missed opportunity, wasn't it?" Mr Devlin replied: "Yes it was."The former chairman of just under five years said the board was told of the incident in September 2022 - but the trust's investigation could not take place until after a police investigation had concluded. The inquiry heard an action plan in relation to the fatal attack was only approved in May 2025. Asked if the trust was not doing anything while the police were investigating, Mr Devlin said: "I don't know if that is fair. I think there will have been a lot of looking at the circumstances of that from an operational team perspective. The formal investigative route, however, was regarded as having to be on hold because of that police investigation."Article continues belowMr Weston asked if there had been an audit of "unsafe discharges" in September 2022 after this incident, it would have picked up Calocane's case. Mr Devlin replied: "It may well have done, yes."The lawyer continued: "And steps could have been taken to avoid the attacks in June of 2023?" The former chairman replied: "It may be the case, yes." The inquiry heard the trust's board was told of another fatal incident involving a mental health patient in February 2023 while a separate non-fatal attack was documented in April of that year.Calocane, who admitted manslaughter and three counts of attempted murder, is detained indefinitely in a high-security hospital after prosecutors accepted his not guilty pleas to murder. The inquiry continues.