A North Carolina man admitted he fatally stabbed his girlfriend’s ex-beau outside a swanky Long Island yacht club as she cheered him on, prosecutors said Tuesday.
Victor Panebianco, 32, of King, pleaded guilty to first-degree manslaughter for knifing Christopher Millwater, 52, twice through his heart and lungs at a parking lot near Stony Brook Yacht Club on Nov. 10, 2025, according to the Suffolk County District Attorney’s Office.
Millwater’s ex-girlfriend, 33-year-old Kacy Corso, and Panebianco plotted to drive from their North Carolina apartment to Long Island to ambush him outside the yacht club where he was known to hang out.
The twisted couple pulled into the same lot as Millwater, before Panebianco exited the vehicle and approached the victim, authorities said.
After Millwater saw Panebianco, he tried to flee the parking lot, but Corso crashed into his car to stop him, prosecutors said.
Millwater, of Selden, looked into Panebianco’s face and uttered the chilling last words, “You’re stabbing me?” and screamed as the maniac pushed a knife through his organs.
Corso witnessed the attack and egged on her new boyfriend, telling him, “don’t believe him, don’t let him fool you,” prosecutors previously said.
Panebianco then heartlessly kicked the mortally wounded Millwater in the head before climbing back into his vehicle and fleeing the scene.
The couple drove back to their shared apartment in North Carolina, where they were arrested days later by the Stokes County Sheriff’s Office.
The Suffolk County Police Department uncovered the bloody scene after receiving a 911 call about an unconscious man on the ground of the parking lot by the upscale yacht club around 3:40 a.m.
Millwater and Corso had been involved in a romantic relationship, but they eventually split, and she grew increasingly hostile toward him, officials have said.
Corso regularly slammed her ex in a series of nutty social media posts — warning him not to contact her and calling him a “grave robber.”
She had moved from New York to North Carolina, where she worked as a DoorDash and Uber driver, according to police.
Panebianco is slated to return to court for sentencing on Sept. 22, where he is expected to be sentenced to 25 years to life in prison.
Corso also pleaded guilty to first-degree manslaughter on July 22, and faces seven years behind bars during her sentencing on Sept. 2.
“The defendant’s guilty plea does not take away the pain of the loss that Christopher Millwater’s friends and loved ones have endured,” District Attorney Raymond Tierney said in a statement.
“However, his admission of guilt spares them from enduring a painful and difficult trial while holding Victor Panebianco fully accountable for this heinous killing,” Tierney added.
