An investigation into the care and treatment of a paranoid schizophrenic who stabbed a police officer to death has been completed by Birmingham and Solihull Mental Health Trust.
The organisation said it would not be making the findings of its internal inquiry into the case of Glaister Earl Butler public at this time but would be passing the report to Birmingham and The Black Country Strategic Health Authority, which has commissioned an external review.
Butler - a martial arts enthusiast who is being detained indefinitely at a high security hospital after admitting manslaughter due to diminished responsibility - was considered safe to be cared for in the community despite his history of violence as well as delusions about the police.
He was seen with a knife by his carers just four days before the killing of Detective Con-stable Michael Swindells, who was trying to arrest Butler for threatening to decapitate a council carpenter on May 21, 2004.
Other mental health work-ers also expressed concern that Butler refused to accept he was ill and was unwilling to take medication to control his condition since first coming to their attention in 1994.
A mental health charity said at the time that the tragic case highlighted the "inadequacies" of supervising some patients in the community, and the defendant's brother also said Butler should have been in care and had been "let down" by the system.
Sue Turner, chief executive of Birmingham and Solihull Mental Health Trust, said: "Our report is now being forwarded to Birmingham and The Black Country Strategic Health Authority, which has commissioned an external homicide review of this tragic case.
"This review will look into the role of all agencies involved in the case and, as part of that, will consider our internal investigation report.
"We cannot publicise the findings of our inquiry until the completion of the homicide review because to do so might prejudice this external investigation."