Rex Heuermann, a suspected serial killer, has been accused of committing his seventh murder

Rex Heuermann, the suspected Gilgo Beach serial killer, has been charged with a seventh woman’s death, according to prosecutors in New York’s Suffolk County.

Valerie Mack, a 24-year-old from Philadelphia, went missing in 2000. Suffolk County police found her partial remains in Manorville, New York, that November. 

The latest charges come as investigators continue to examine DNA evidence with state-of-the-art techniques that the defense plans to challenge, according to two sources familiar with the matter.

Police in at least three other states were also looking into unsolved cases for potential connections to Heuermann, Fox News Digital has previously reported.

A map created by Suffolk County Police shows the locations of the bodies found on Gilgo beach between 2010 and 2011. (Suffolk County Police)

Heuermann has pleaded not guilty to the prior charges. He is being held without bail at the Suffolk County Jail in Riverhead, New York.

According to prosecutors, the 60-year-old architect maintained a double life – a mild-mannered commuter with an office in Manhattan by day and a prolific abuser of sex workers in his downtime.

Investigators allegedly recovered his now-estranged wife’s DNA at one of the crime scenes but say they believe it was transferred there by the killer.

She and the rest of Heuermann’s family were out of town for the murders, according to Suffolk County District Attorney Ray Tierney.

Heuermann’s wife, Asa Ellerup, filed for divorce shortly after his arrest but has said she doesn’t believe him capable of the accusations against him and would wait for the case to play out at trial.

This is a breaking news story. Check back with Fox News Digital for updates.