Ten months after a 17-year-old boy was fatally shot by an Edmonton police officer, the Alberta Serious Incident Response Team has found the officer's actions were justified.

The findings don't sit well with the mother of the deceased teen, who still holds the police responsible for her son's death.

On Tuesday, ASIRT announced their months-long investigation into the shooting had wrapped up, and cleared the officer involved of any wrongdoing.

The investigation stems from an incident that occurred in the early hours of Saturday, February 5, when police responded to reports of a possible robbery at the Coliseum LRT station; three suspects, including Green fled the scene.

Police and bystanders were interviewed by ASIRT investigators, which revealed Green had been carrying an aluminum bat and a four-inch knife at the time.

According to investigators, Green had been told to lower his weapons – instead, he raised them, and shouted "You're going to have to shoot me first."

Green suffered three gunshot wounds to the chest, later on, the medical examiner found he was under the influence of alcohol and marijuana at the time.

"Why did it have to be three shots?" Carol Green, Cyrus' mother told CTV News. "That's what gets me angry."

Shortly after the findings of the investigation were released, Edmonton Police Chief Rod Knecht released a statement, saying:

"Today's ASIRT report confirmed what we believed all along – that our officers acted appropriately under very difficult, life-threatening circumstances. I have confidence in our officers, in their training and equipment, and in their experience and skills."

Still, the findings have done nothing to heal the broken heart of a grieving mother.

"It's not fair what happened to him," Green said. "I'm the one left with tears, right?"

Green told CTV News shortly after her son was shot, she filed a lawsuit against the Edmonton Police Service.

With files from Serena Mah