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Major update after former Riverdale star Ryan Grantham, 24, murdered mom and FILMED her body in gruesome Go-Pro killing

A FORMER Riverdale star has been found guilty of shooting his mom while she played the piano in a gruesome Go-Pro killing, a judge announced.

Ryan Grantham, 24, was sentenced to life in prison after he pleaded guilty to the 2020 second-degree murder of his mother Barbara Waite inside their Vancouver home.

Ryan Grantham, now 24, was sentenced to life in prison after pleading guilty to his mother's murderCredit: Getty
Barbara Waite was brutally shot on camera by Grantham in 2020, prosecutors saidCredit: Squamish Funeral Chapel
The Canadian actor was known for his performances in Riverdale and Diary of a Wimpy KidCredit: Netflix

Justice Kathleen Ker delivered the sentence Tuesday, calling the situation tragic and heartbreaking, CBC reported.

She said the victim impact statements emphasized the "life-shattering" effects of Grantham's crime.

The sentencing comes after an investigation brought disturbing details surrounding the Diary of a Wimpy Kid actor to light.

Grantham, who was 21 at the time, allegedly rehearsed the attack on his mother before executing the plan.

He filmed "rehearsals" of the murder on his Go-Pro, on one occasion even filming himself approaching her from behind, gun in hand, while she played the piano.

Prosecutors revealed that the day after his mother's murder, Grantham loaded three guns and ammunition, 12 Molotov cocktails, and camping supplies into his car before mapping the way to Justin Trudeau's home.

Before leaving, he hung a rosary on his mother's piano where her body was still laying.

Then, Grantham lit candles around his dead mother's body.

Grantham set out for Trudeau's home, but ultimately turned around to, according to the court prosecution, commit acts of violence elsewhere.

Grantham reportedly thought about committing an act of mass violence either on Vancouver's heavily trafficked Lions Gate Bridge, or at his university Simon Fraser University.

According to Fox News, psychiatric reports on Grantham claim that he was motivated to kill his mother so that she wouldn't witness the other acts of violence he was planning to commit.

"I'm so sorry mom, I'm so sorry Lisa ... I hate myself," he wrote in a March 31, 2020, journal entry, according to prosecutors.

"There's a lot of media of me out there … film and TV … hundreds of hours of me that can be viewed and dissected ... No one will understand."

During the sentencing, Ker said that Grantham had been in a downward spiral for months leading up to the crime.

He spent more and more time smoking marijuana and watching violent videos on the dark web, according to the justice.

Grantham apparently felt isolated and consumed by violent thoughts, and Ker said his mental health may have had mitigating effects during the murder.

She announced that Grantham is now seeking psychiatric help in prison and has heard positive reviews about his behavior.

Ker also acknowledged Grantham's apology in June, saying she believed he is truly remorseful.

Grantham addressed the court earlier this year saying: "I cannot explain or justify my actions. I have no excuse."

"It hurts me to think about how badly I've wasted my life.

"Someday, if I'm ever released from prison, I hope to continue on this path of bettering myself."