CNN
—

Rex Heuermann, a Gilgo Beach serial killing suspect, has been charged with the murder of a seventh woman, according to a supplemental indictment.

He was charged with second-degree murder in the killing of Valerie Mack, whose remains were found in November 2000 on eastern Long Island.

Mack was a 24-year-old mother from Philadelphia and was working as an escort at the time of her appearance.

Heuermann was first arrested in July 2023 and charged with the murders of four women whose bodies were discovered bound with belts or duct tape and wrapped in burlap on a section of Gilgo Beach on Long Island in 2010.

These victims – Melissa Barthelemy, Megan Waterman, Amber Costello and Maureen Brainard-Barnes – became known as the “Gilgo Four.” Heuermann pleaded not guilty to all four counts.

In June 2024, two additional second-degree murder charges were added for the deaths of Jessica Taylor and Sandra Costilla. Taylor was killed in 2003, Costilla in 1993. Heuermann also pleaded not guilty to those charges.

The women were among at least 11 remains discovered near the waterfront in Suffolk County on Long Island since 2010.

The 60-year-old architect is scheduled to appear before state Supreme Court Justice Timothy Mazzei on Tuesday morning in Riverhead, New York.

correction: An earlier version of this story misspelled Valerie Mack’s last name.