The crimes carry an automatic life sentence, but Justice Glen Poelman agreed with a Crown recommendation to increase the minimum 25-year parole ineligibility period due to the level of violence.
"He committed three consecutive murders of members of his intimate circle, each exceeding in brutality and violence the one before it," Poelman said Thursday.
"The callous abandonment of Ms. Toller's body for five days followed by the murders of two more family members are uniquely reprehensible."
An agreed statement of facts said Toller, Duthie's girlfriend of five years, was last seen on video footage from outside her condo unit about 4 a.m. on July 26, 2018. Duthie was captured on the video leaving the condo alone about an hour later.