A woman has admitted to helping kill her ex-boyfriend in a stabbing outside the Stony Brook Yacht Club, a plea that brings a measure of resolution to a killing that shattered the calm of the Long Island waterfront. The admission marks a turning point in a case that has moved through the courts since the deadly attack, and sets the stage for the prosecution of the man still accused of murder.
According to court records, Kacy Corso took a deal, pleading guilty to manslaughter rather than facing a murder charge at trial. The reduced plea acknowledges her role in the death while stopping short of the more serious count, a resolution that reflects the way prosecutors have carved up responsibility between the two people accused in the killing.
The victim in the case was Christopher Millwater, Corso's former partner. Prosecutors say the confrontation that ended his life played out outside the yacht club last year, turning a spot associated with leisure and the water into the scene of a fatal act of violence that would leave one man dead and two people charged.
According to authorities, Corso did not act alone. Prosecutors say she and her then-boyfriend, Victor Panebianco, chased and stabbed her ex, Christopher Millwater. That account places both of them at the center of the attack, with Corso's guilty plea now formally tying her to the events that led to Millwater's death.
While Corso has resolved her part of the case, Panebianco's is far from over. He is still charged with murder in connection with the stabbing, meaning the most serious accusation in the killing remains to be tested in court. His case is expected to move forward separately as prosecutors press ahead with the murder count against him.
The stakes for Panebianco are steep. Authorities say he faces up to 25 years in prison if he is convicted of the murder charge he now confronts. As his case advances, Corso's admission stands as a stark marker of how a relationship's bitter end culminated in a deadly encounter outside the Stony Brook Yacht Club.