A new search is underway in Long Island as police dogs comb through a wooded area in search of more clues in connection with the Gilgo Beach serial killings.

The search that began Tuesday spilled into Wednesday as detectives and a K-9 probed the vast woods during a search in Manorville, New York.

The Suffolk County District Attorney's Office would not comment on the details of the investigation.

"The Suffolk County Police Department, the New York Police Department and the New York State Police are working with the District Attorney's Office on an ongoing investigation," the district attorney's office said in a statement to ABC News. "We do not comment on investigative steps while they are underway. We will make further statements when appropriate."

Rex Heuermann, 59, of Massapequa, Long Island, was first arrested in July 2023 for the alleged serial killings of three female sex workers whose remains were found in the Gilgo Beach area in 2009 and 2010. He was charged with three counts each of first- and second-degree murder, according to authorities. In January, he was charged with the murder of a fourth woman. He pleaded not guilty to all the charges.

According to court documents, the victims appeared to be strangled, CBS News reported. Their bodies were bound and wrapped in burlap. Heuermann may be connected to six more slayings in the area.

Heuermann, a soon-to-be divorced father of two, previously worked as an architect in Manhattan, where he was arrested last summer outside his office.

"He was very organized. He was very friendly," a work acquaintance said, according to NBC News. "I did not see this coming."