MONTREAL - Day three of deliberations in the Luka Rocco Magnotta murder trial has come to an end without a verdict.

The jurors will be back for a fourth day on Friday.

Magnotta is charged with first-degree murder and four other charges in the slaying and dismemberment of Chinese engineering student Jun Lin in May 2012.

The eight women and four men began deliberating on Tuesday, emerging on Wednesday to ask the judge whether a personality disorder is a disease of the mind from a legal standpoint.

Quebec Superior Court Justice Guy Cournoyer told them it is.

Magnotta has pleaded not guilty by way of mental disorder and is seeking to be found not criminally responsible. His lawyer says he is schizophrenic and couldn't tell right from wrong at the time of the slaying.

Prosecutor Louis Bouthillier has argued the schizophrenia was a misdiagnosis and that his medical problems and behaviour are likely the result of personality disorders.