Autopsies on three members of a family killed at their home in Ajax, last week show two were stabbed and one died of asphyxiation.
In a release, police say the autopsies on Krassimira Pejcinovski, 39, her son Roy Pejcinovski, 15, and daughter Venallia Pejcinovski, 13, were done late last week.
They did not immediately indicate which victim was strangled.
Cory Fenn, 29, has been charged with three counts of second-degree murder in the case.
Fenn, who was Krassimira Pejcinovski's romantic partner, remains in custody pending his second appearance.
Police say they have been questionned about Fenn's appearance in court on March 15th, when he showed up with a black eye and abraisions to his face.
Officers admitted to NEWSTALK1010, that there was an altercation at the time of his arrest, and the SIU was notified, but the injuries weren't bad enough to warrant a deeper investigation.
Durham Regional Police say a tactical officer also suffered minor injuries during the arrest.
(with files from Canadian Press)