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Jennifer Winkler and her father, Dale Winkler, are shown in this undated handout image. Dylan Pountney was sentenced to 12 years in prison without the possibility of parole for killing Jennifer in 2021 in a horrific knife attack in an Alberta school classroom.Dale Winkler/The Canadian Press

Family of a 17-year-old girl stabbed to death as she sat in her desk in an Alberta high school had angry words for her killer at a sentencing hearing Thursday.

Dale Winkler said loved ones of his daughter Jennifer Winkler haven’t been able to move on with their lives since she was stabbed multiple times by a classmate in a high school in Leduc, south of Edmonton, in 2021.

“It’s almost too much to bear,” Mr. Winkler said as supporters with shirts calling for “Justice for Jenny” held back tears in a Wetaskiwin, Alta., courtroom.

He then crumpled a piece of paper and threw it at Dylan Pountney.

“Rot in hell you bastard!” Mr. Winkler screamed as he stormed out of the courtroom while pointing at Mr. Pountney.

Mr. Pountney, 22, was convicted in July of second-degree murder.

He occasionally wiped tears from his face as victim impact statements were read in court.

The trial heard Mr. Pountney was 19 when he stabbed the girl in front of horrified students and a teacher during a break in a social studies class at Christ the King School. She stood up then collapsed near the classroom door.

A chief medical officer testified the girl died from massive blood loss from five wounds near her neck and shoulder.

Court of King’s Bench Justice Eric Macklin handed Mr. Pountney an automatic life sentence and ordered him to serve 12 years before he can apply for parole.

A Crown prosecutor had recommended 15 years, while the defence asked for 10 years.

The defence had admitted Mr. Pountney killed the girl but argued he was suffering from a psychosis and lacked the intent for murder.

Defence lawyer Derek Anderson told court Thursday that Mr. Pountney’s mother once had a relationship with the girl’s father and Mr. Pountney blamed the man for his mother’s death.

The girl was an “indirect” target, Mr. Anderson said.

“He perceived wrongly that the deceased did something wrong, and he wanted to do something to get back.”

Mr. Pountney’s father said his son is sorry and has made changes since the killing. The trial heard Mr. Pountney wrote a book while in custody and converted to Islam.

“His family is extremely proud of what he has accomplished,” Nathan Pountney told court.

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