NEW YORK (CBSNewYork/AP) — A man who pleaded guilty to the meat-cleaver killings of five relatives has been sentenced to 125 years to life in prison.

A state Supreme Court judge in Brooklyn handed down the term to Mingdong Chen on Tuesday for the October 2013 attack on his cousin’s wife — Qiao Zhen Li, 37 — and her four children in Sunset Park. The children’s ages were 9, 7, 5 and 18 months.

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The 27-year-old Chen pleaded guilty earlier this month to murder and manslaughter charges. His attorney declined comment.

“This defendant’s vicious and sadistic attack makes him completely unfit to remain in society, and he will now spend the rest of his life behind bars,” Brooklyn District Attorney Ken Thompson said. “While we will never know what drove him to commit these murders, I hope that this sentence will offer this grieving family some measure of comfort.”

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Chen was found dripping in blood after slashing his victims’ throats.

He had been fired from restaurant jobs and told investigators he envied the success of his relatives, who were fellow immigrants from China.

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