A Nunavut court judge has sentenced Mathewsie Alariaq to life in prison with no possibility of parole for 12 years in the stabbing death of his 16-year-old nephew, Karl Qinnuayuaq.

Alariaq pleaded guilty Tuesday to second degree murder.

Mathewsie Alariaq

Mathewsie Alariaq was sentenced Wednesday to life in prison with no possibility of parole for 12 years in the stabbing death of his 16-year-old nephew, Karl Qinnuayuaq, in April 2012. (CBC)

Friends and family of Qinnuayuaq wept as the facts were read in court.

It happened on April 16, 2012. Thirty-year-old Alariaq was upset with his then girlfriend, who said she was going to have an abortion and end their relationship. He broke into various houses and committed several assaults that night.

Then he broke into his aunt's house. Alariaq was angry, and stabbed his nephew Qinnuayuaq to death. The victim's 12-year-old brother heard yelling, and left the house with his mother to get help.

The pathologist’s report said Qinnuayuaq suffered 51 injuries.

Alariaq then barricaded himself in another house with guns, threatening the RCMP and the public. The community was on lock-down until Alariaq surrendered a number of hours later.

Defence lawyer James Morton said Alariaq's childhood was plagued by physical abuse and the presence of alcohol.

In a victim impact statement, Qinnuayuaq's mother said she hates Alariaq for what he did.

A conviction of second-degree murder means a mandatory life sentence. The Crown and defence jointly recommended 12 years before Alariaq could be eligible for parole.

Justice Andy Mahar told the court that what Alariaq did was horrendous and starkly horrible. Mahar said it's hard to imagine a more pointless death.​ The judge also expressed his deepest sympathies to the family and friends of the deceased who were present in courtroom.