Adrian Kinkead has been found guilty of the August 16th 1995 murders of Marsha and Tammy Ottey.
Mr. Justice Harry LaForme called the crime "the work of an evil and fiendish person," and reserved his pronouncement on whether the terms should be served concurrently or consecutively.
As a result, Kinkead could serve at least 75 years in prison. He is currently serving a life sentence for the murder of TTC ticket collector Dimitrija Trajceski.
Avis Ottey, mother of the slain girls, said she was relieved by the verdict.
"God wants us to forgive but He will have to forgive me for saying this: he's going to be in jail until he dies. I hope to God he stays in jail."