The crazed boyfriend who fatally stabbed his Queens bartender gal pal was sentenced Friday — as the victim’s family ripped the heartless killer as a “pathetic coward” who took away a “beautiful” soul.

Marcin Pieciak, 37, was sentenced to 24 years in prison for the brutal attack in which he stabbed his Irish girlfriend Sarah McNally 19 times while she worked inside the Ceili House Bar in Maspeth, Queens on March 30, 2024.

Relatives of McNally, a 41-year-old bar worker who was dating Pieciak at the time of her death, penned an emotional victim-impact statement slamming the lowlife for taking away their loved one.

“No woman should ever lose her life because she wants to leave a relationship,” McNally’s grieving relatives wrote in the statement, read in Queens Supreme Court during the h

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