A teenager has been sentenced to life in prison for his role in the murder of 16-year-old Hannah Leflar.

Members of the victim’s family cheered after a judge sentenced Skylar Prockner of Edenwold as an adult. The judge said a youth sentence would not be long enough for the crime.

"I can finally say Skylar Prockner killed my daughter," Hannah's mother, Janet Leflar, said outside court.

As Prockner was led out of the courtroom, someone shouted "we love you, Skylar. Unfair sentence."

Prockner pleaded guilty to first-degree murder earlier this year in the death of Leflar, who was found fatally stabbed in her Regina home in January 2015.

According to an agreed statement of facts, Prockner recruited other teens to help him spy on Leflar four months before she was murdered.

When Leflar got a boyfriend, the group hatched a plot to ambush the two of them at a secluded site behind a north-end elementary school.

Court heard the plan was for one friend to lure the boyfriend and the victim to a spot designated by the group as the “attack zone.” Prockner began gathering items that the group would use, including knives and baseball bats.

But the plan was called off when Leflar unexpectedly broke up with her boyfriend.

On the day Leflar was killed, Prockner used an anonymous Facebook account to surreptitiously view the victim’s Facebook profile. He found photos of Leflar and a new boyfriend.

A few hours later, Prockner was hiding outside Leflar's house, armed with a hunting knife, waiting for her to come home from school. When Leflar arrived, he followed her inside and stabbed her to death.

A second teenaged boy, who pleaded guilty to second-degree murder in Leflar's death, is expected to be sentenced in September. He originally faced a charge of first-degree murder.