An Auckland man who stabbed and killed his flatmate has been found not guilty of murder because he was insane.
Geoffrey Tampin stabbed his long-time friend Dean Andrew Clark more than 15 times in a violent attack 26 June last year.
He cleaned the butcher's knife, had a shower and returned to bed after the killing.
Geoffrey Tampin had only lived with the 36-year-old for a week but they were long-time friends.
The High Court in Auckland has been told Mr Tampin is a paranoid schizophrenic and knew he was stabbing someone and who it was.
But evidence from psychiatrists shows he heard overwhelming voices telling him to kill his friend.
Justice Collins says he had been under the care of Auckland's mental health services when he moved into the flat just a week before, but his health deteriorated significantly before the killing.
The expert witnesses say he did not know what he was doing was morally wrong.
He phoned his mother in the morning asking her to call the police.
Mr Tampin has been classed as a special patient and will now be detained in a mental health facility.