Ryan Grantham: Why 'Riverdale' Actor Killed His Mother

Riverdale actor Ryan Grantham has been sentenced to life in prison for the murder of his mother and the reason for the shocking act may have come to light.

Reports confirm that a court heard how Grantham had rehearsed the killing and even taken videos which were shown in court, including a four-minute segment captured in the hours after the killing in which he confesses to the murder and shows his mother's dead body. 

Referencing two psychiatric reports, Crown prosecutor Michaela Donnelly said there was consensus Grantham was going through an intense period of clinical depression in the months leading up to the murder while maintaining an outward appearance of being well functioning.

Ryan Grantham

He also was experiencing urges to commit violence and kill himself, along with escalating feelings of self-hatred and guilt over his mother, potentially learning he had stopped attending classes at Simon Fraser University.

Both reports also confirm that he had a cannabis use disorder.

It was further revealed that Grantham decided to kill his mother to spare her from seeing the violence he intended to commit.

Grantham left Squamish the day after the murder with his mother's body still where it had fallen, intending to drive 50 hours to Ottawa to kill Justin Trudeau.

He drove as far as Hope before turning around with thoughts he would instead commit an act of mass violence at Simon Fraser University or other locations but instead turned himself to Vancouver police that night. 

The actor who shot to stardom for his role in the 2010 'Diary Of A Wimpy Kid' movie will now face a life sentence with an option of parole after 18 years.