MONTREAL -- The jury at Luka Rocco Magnotta's murder trial has completed its second day of deliberations without reaching a verdict.

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 officially asked the judge today whether a personality disorder is indeed a disease of the mind from a legal point of view.

Quebec Superior Court Justice Guy Cournoyer simply told them yes and they resumed their deliberations, which will now continue Thursday morning.

Magnotta has pleaded not guilty by way of mental disorder and is seeking to be found not criminally responsible.

In his instructions to the jurors Monday, Cournoyer suggested they start their work by focusing on the mental disorder defence.

On the murder charge, the jury has four options: find Magnotta guilty of first-degree murder, second-degree murder or manslaughter, or find him not criminally responsible by way of mental disorder.

The judge has told the jurors that if they find the accused not criminally responsible, that verdict must carry through to all five charges.

The jurors heard some 66 witnesses over 40 days the trial sat.

They will have to consider hundreds of pages of medical files, expert reports and the physical evidence gathered in Montreal as well as Europe.