A man killed outside a swanky Long Island yacht club realized he was in mortal danger just moments before his ex-girlfriend’s new beau stabbed him to death while she cheered him on, prosecutors said Tuesday.

Victim Christopher Millwater , 52, looked into the face of 32-year-old Victor Panebianco and said “you’re stabbing me?” before the maniac stabbed him twice through his heart and lungs at a parking lot near Stony Brook Yacht Club on Nov. 10, Suffolk County prosecutors revealed in court.

Millwater then screamed for help as Panebianco sat on top of him and pushed the knife through his organs, officials said. Millwater’s ex-girlfriend – 33-year-old Kacy Corso – witnessed the attack and had egged on her new boyfriend urging him “don’t believe him, don’t let him fool you,” prosecutor

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