Tara Rincon

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Jul 23, 2026, 5:08 AM

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Updated

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A woman has pleaded guilty to manslaughter charges for the killing of her ex-boyfriend in Suffolk County.

According to court records, Kacy Corso, 34, of East Setauket, changed her original plea of not guilty during a court appearance Wednesday.

As News 12 has reported, Corso was arrested in connection with the murder of Christopher Millwater outside of the Stony Brook Yacht Club last year.

Prosecutors say she and her then-boyfriend Victor Panebianco chased down the 52-year-old Selden man before stabbing him to death on Nov. 10.

Panebianco is still charged with murder, and he faces up to 25 years in prison if convicted.

Corso additionally admitted to hindering prosecution as part of the plea deal and is set to be sentenced in September.