Kacy Corso
Introduction
Kacy Corso is a North Carolina woman who was sentenced on September 23, 2026 to seven years in prison for her role in the ambush killing of Christopher Millwater, her former lover, in the parking lot of the upscale Stony Brook Yacht Club on Long Island in November 2025. Corso, 34, a former DoorDash and Uber driver, pleaded guilty in July 2026 to first-degree manslaughter and hindering prosecution after prosecutors said she helped lay in wait for Millwater and then rammed his car to box him in as he tried to flee, while her boyfriend, Victor Panebianco, chased him down and stabbed him to death. She received the reduced sentence as part of a cooperation agreement with prosecutors, and apologized to Millwater’s family in court before learning her fate one day after Panebianco was sentenced to 25 years for the same killing.
Background Information
Corso, 34, lived in King, North Carolina, and worked as a DoorDash and Uber driver before the case. She had previously had a fling with Millwater, a 52-year-old Selden, New York, father of two who fished at the Stony Brook Yacht Club, and prosecutors and court filings described the relationship ending badly: Corso grew increasingly hostile toward her ex after the split, at one point calling him a “grave robber” in a social-media post, in a months-long feud that played out publicly on Facebook leading up to the killing.
By late 2025 Corso was in a relationship with Victor Panebianco, 32, also of King, North Carolina. Authorities said the pair drove from North Carolina to Long Island together in Corso’s car, arriving roughly 90 minutes before the killing, and lay in wait for Millwater at the waterfront club where he liked to fish.
The Controversy or Incident That Led to Their Cancellation
Adjudicated. Corso’s conviction rests on her own guilty plea in July 2026 to first-degree manslaughter and hindering prosecution and is a matter of court record; the account of the attack below comes from statements by the Suffolk County District Attorney’s office. Her co-defendant Panebianco separately pleaded guilty to the same manslaughter charge. Neither case was tried to a jury.
Prosecutors said Millwater arrived at the yacht club around 3:40 a.m. on November 10, 2025, not knowing that Corso and Panebianco were already waiting in the parking lot. When Millwater spotted them, he tried to escape by driving around Corso’s car toward the exit, but Corso crashed into him, preventing him from leaving, and he jumped out and tried to flee on foot. Surveillance footage, according to prosecutors, showed Panebianco giving chase “while swinging a knife,” catching up to Millwater, and plunging the knife into his chest twice; a struggle ensued with Corso yelling at Millwater, and Panebianco also kicked Millwater in the head as he lay motionless on the ground. Millwater’s last words, per the New York Post’s account of the prosecution’s case, were “You’re stabbing me?”
Police responded to a 911 call reporting an unconscious man in the lot and found Millwater dead, prosecutors said. Corso and Panebianco then drove back to their apartment in North Carolina, where they were later picked up by the Stokes County sheriff; Panebianco was arrested nine days after the killing. Corso was arraigned on murder charges in Suffolk County court on November 20, 2025.
Public Reaction and Consequences
Corso pleaded guilty in July 2026 to first-degree manslaughter and hindering prosecution, having been offered a reduced charge in exchange for cooperating with prosecutors. In a Suffolk County court in Riverhead on September 23, 2026, she apologized to Millwater’s family before Supreme Court Justice Timothy Mazzei sentenced her to seven years in prison. “It should have never happened,” she told the judge, according to Newsday’s account cited by the New York Post. The sentencing came one day after Panebianco received 25 years in prison for first-degree manslaughter in the same killing.
Suffolk County District Attorney Raymond Tierney, whose office prosecuted both defendants, said after Panebianco’s sentencing that “the killing of Christopher Millwater at the hands of the defendant was brutal” and that the court had imposed the maximum sentence his office requested. Millwater’s nephew, Chase Millwater, said at the sentencing hearing that his uncle had gone to the yacht club for “peace and tranquility” after struggling with sobriety and cancer, adding, “But it will never be the same village for us.”
Current Status
As of September 23, 2026, Corso, 34, is serving a seven-year prison sentence for first-degree manslaughter and hindering prosecution in the death of Christopher Millwater. Her co-defendant and boyfriend Victor Panebianco began a 25-year sentence the day before. With both defendants having pleaded guilty, no trial is pending, and no additional charges arising from the killing have been reported.
Impact on Their Career/Life
The love triangle ended three lives. Millwater, 52, was killed in the parking lot of the club where he sought peace, days after posting on Facebook about having “made peace with everything.” Panebianco, 32, went from a life in North Carolina to a quarter-century in a New York prison. Corso, 34, traded gig work as a DoorDash and Uber driver for a seven-year term, her Facebook feud with her ex now the documented motive in a homicide — and her own courtroom apology, “It should have never happened,” the line she is left with on the public record.
Sources
- New York Post, “Ex-girlfriend in twisted love-triangle slaying at Long Island yacht club learns her fate,” September 23, 2026. source
- Us Weekly, “Man Sentenced for Killing Girlfriend’s Ex at Yacht Club,” September 2026. source
- Greater Long Island, “North Carolina man pleads guilty in Stony Brook Yacht Club stabbing that followed love triangle,” August 11, 2026. source
- X post by @nypost announcing the story, September 23, 2026. source