As shown by prosecutors in court, Grantham then took a GoPro video shortly after the murder in which he confesses to the crime and shows his mother's body. In the clip, he admitted, "I shot her in the back of the head. In the moments after, she would have known it was me."

The next day Grantham covered his mother's body with a sheet, surrounded it with lit candles, and hung a rosary from the piano; then he loaded his car with guns, ammunition, and Molotov cocktails, before driving east toward Ottawa's Rideau Cottage to kill Canadian Prime Minister Justin Trudeau. Instead, he only made it to Hope, BC, before he turned around with a new intention to commit a mass shooting at Simon Fraser University, where he was enrolled, or on the Lions Gate Bridge. Ultimately, he drove himself to the Vancouver Police Department and turned himself in.

Judge Sentences Ryan Grantham to Life

The iZombie actor's sister delivered a victim impact statement that spoke to the "life-shattering" effects of the crime on the rest of the Grantham family, which influenced the court's sentencing decision. Justice Kathleen Ker called the case heartbreaking, tragic, and life-shattering as she gave him the sentence. In her reasons, Ker summarized how Grantham was on a downward spiral before the murder, spending an increasing amount of time watching violent videos on the dark web while feeling consumed by suicidal and homicidal urges.