When looking for information about ghosts and hauntings in the GTA, the definitive resource seems to be The Toronto Ghosts and Hauntings Research Society.
My favourite story is that of Ivan Reznikoff and Paul Diablos who engaged in a deadly fight over a woman at University College at the University of Toronto. The full story and pictures are here. As a student there, tales of the hauntings Reznikoff were legendary and many a day I'd visit the door and see the mark where Reznikoff's axe missed Diablos. As the legend goes, this axe battle continued atop the Soldier's Memorial Tower where Reznikoff fell to his death.
And yes, the Diablos who buried Reznikoff's body in the foundations of the building and vanished from Toronto is the namesake for the Diablos Coffee Bar where many an undergrad can still be found to this day skipping class.