MONTREAL - Jurors at Luka Magnotta's murder trial begin their fourth day of deliberations this morning.

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 and have emerged just once over the three days.

That was on Wednesday when they asked 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.