In June 2023, Valdo Calocane went on a violent spree, killing students Barnaby Webber and Grace O'Malley-Kumar, both 19, along with caretaker Ian Coates, 65.

After pleading guilty to manslaughter due to paranoid schizophrenia and attempted murder, Calocane was sentenced to an indefinite hospital order in January 2024, a decision that faced criticism from victims' families.

The family of Grace O'Malley-Kumar criticized a meeting with the IOPC as 'offensive,' expressing dissatisfaction with the conduct of officials during the discussion.

Dr. Sanjoy Kumar, Grace's father, expressed his disappointment that the IOPC regional director began the meeting with a prayer instead of addressing the pressing issues surrounding his daughter's death.

Barnaby Webber's mother, Emma Webber, voiced concerns that the Crown Prosecution Service largely ignored the families' worries regarding the case.

Three police officers were scheduled for a misconduct meeting related to their investigative failures, but the meeting was postponed by the police force.

In March 2025, the IOPC announced a reinvestigation of Calocane's prior history and an outstanding arrest warrant, prompted by new evidence and appeals from bereaved families.

The IOPC confirmed receipt of a complaint regarding the director's conduct during the meeting and stated it is being addressed through their complaints procedure.

Derrick Campbell, the IOPC regional director involved in the meeting, is now the director of engagement for the watchdog.

An earlier report by the Independent Office for Police Conduct (IOPC) revealed that police failed to adequately investigate a prior assault by Calocane, which could have prevented his subsequent attacks.

In response to these failures, a two-year public inquiry was announced in February 2024 to scrutinize the actions of prosecutors, police, and medical professionals.

Chaired by senior retired judge Deborah Taylor, the inquiry aims to deliver recommendations within two years to prevent similar tragedies in the future.