Police provide update on motive and timeline of Saskatchewan mass stabbing rampage.

Police in Canada say they may never know the motive behind a stabbing rampage that left 11 people dead and 17 injured last year. The accused, Myles Sanderson, died in police custody a few days later. The investigation into the stabbing rampage is still not complete, and police say some of the pieces of information may never be known. The RCMP examined 42 different crime scenes, seized about 700 exhibits, and spoke with more than 250 witnesses.