A Setauket woman pleaded not guilty to a second-degree murder indictment Wednesday in the fatal stabbing last month of her ex-boyfriend at the Stony Brook Yacht Club.

Kacy Corso, 33, appeared in a Riverhead courtroom Wednesday following a grand jury's indictment on charges of murder and hindering prosecution. Authorities said she confronted her ex-boyfriend, Christopher Millwater, 52, of Selden, Nov. 10 at the yacht club, rammed his car, and her new boyfriend, Victor Panebianco chased him down and stabbed him.

Suffolk County Judge Timothy P. Mazzei ordered Corso remanded in jail without bail.

Authorities said Panebianco, 32, was arrested in North Carolina and was expected to be extradited to be arraigned on the indictment Thursday, following a criminal complaint accusing him of stabbing

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