A health authority chief has expressed "regret" after a report highlighted shortcomings in the care of a psychotic teenager who stabbed a neighbour.
Paranoid schizophrenic Sean Dunbar repeatedly stabbed Jim Tyler, 80,
after bursting into his home in Fen Ditton, Cambridgeshire, in 2002.
Mr Tyler's wounds needed 150 stitches and left him permanently disabled.
A report into the episode criticised the Cambridgeshire and Peterborough Mental Health Partnership NHS Trust.
It said there were a "number of problems" with the management of Mr Dunbar's case.
Mr Dunbar, 18 at the time of the attack, was sentenced to permanent hospitalisation after he was convicted of attempted murder in December 2003.
Dunbar had been released from a psychiatric hospital at Fulbourn near Cambridge so that he could live with his mother seven months before he attacked Mr Tyler.
His condition deteriorated after he left hospital and the report, compiled by an independent panel of health experts, said the risks he posed had been
Richard Taylor, chief executive of the Cambridgeshire and Peterborough Mental Health Partnership NHS Trust, said "arrangements" had been tightened.
"I would like to express our deep regret about this incident and to assure local people that we are firmly committed to doing everything we can to reduce
the risks of something like this happening again," he said.
"We acknowledge that there were shortcomings in Sean's care."