Investigators have linked one of two phone numbers in an alleged planning document belonging to Gilgo Beach serial murder suspect Rex A. Heuermann to a former Bronx sex worker, a law enforcement source told Newsday.

The phone numbers were made public on June 6 when Suffolk County District Attorney Ray Tierney asked for help in identifying a woman who investigators believe Heuermann may have targeted around 2002.

The law enforcement source says investigators have since confirmed that one of the numbers, 917-294-4402, belonged to Danielle Goodling, a former Bronx sex worker who died in 2021 at age 42 of an apparent drug overdose and liver failure, her family told Newsday.

Heuermann, 60, of Massapequa Park, has been charged so far in the killings of six women whose remains were found along Ocean Parkway near Gilgo Beach, in Manorville or in the East End hamlet of North Sea. Investigators continue to investigate him in connection with other killings in Suffolk County, Tierney said.

Heuermann allegedly used a planning document between 2000 and 2002 that investigators say enabled him to systematically plan his murders and prepare to flee from law enforcement, prosecutors announced in June.

In an interview Wednesday, Tierney said that while the phone numbers had previously led to dead ends in the investigation, publicity efforts in June led to additional information that the Gilgo Beach Task Force is “still evaluating.”

Tierney confirmed that number 4402 was associated with a woman, but declined to give her name. The second number, a pager, proved more difficult to verify who had the number.

“We are still working on the second number (917-898-9854),” the district attorney said. “Any information regarding the identity of the person who had those numbers could potentially be relevant.”

The number 4402 goes to voicemail, which was last registered to a woman in Queens. The pager is no longer in service.

The law enforcement source said investigators’ goal is to compare and collect various numbers associated with Goodling using Heuermann’s devices to authenticate the contents of the alleged scheduling document as evidence of contact with a sex worker. That process is ongoing, the source said.

Heuermann’s defense attorney, Michael J. Brown of Central Islip, declined to comment for this article.

In the alleged planning document, the phone numbers are assigned to a person identified only as “Megan?” and who, according to prosecutors, is also referred to as Target 1.

“TRG T1, MEGAN? SMALL IS GOOD,” the document states.

Public records from 2002, the year in which prosecutors say Heuermann kept the alleged planning documents, list Goodling as 5’6″ tall and 120 pounds.

In June, Goodling’s mother, Cindy Fitt of Osceola Mills, Pennsylvania, told Newsday that her daughter ran away from home as a teenager and began working as a prostitute in the late 1990s. Fitt said Goodling’s phone number changed several times over the years, but she remembered it having the 917 area code in the late 1990s. Fitt could not recall her daughter ever telling her that she used the name Megan.

Records obtained by Newsday from Manhattan Criminal Court show that Goodling was arrested 10 times between 1998 and 2004 in the district where Heuermann ran an architectural consulting business. According to copies of the criminal complaints, she was charged twice in 2002.

Goodling was arrested shortly after midnight on January 25, 2002, and charged with prostitution. Court records show she had met with an undercover NYPD detective on Fifth Avenue near East 59th Street. On February 23, 2002, she was arrested shortly after midnight and charged with loitering for the purpose of prostitution at the corner of East 50th Street and Lexington Avenue, court records show. Both locations are just 1.5 miles from Heuermann’s former office on West 36th Street.

At one point, Fitt said, Goodling’s father, who has since died, was called to New York to identify a body in a morgue. It was not her daughter, but someone who had her ID, Fitt said.

Fitt called the allegations made in prosecutors’ June bail application, which include the alleged planning document, “disturbing reading.” She said she was the only family member to speak to Goodling.

“She knew I loved her and she could call,” Fitt said, adding that before her death, her daughter had quit sex work and was helping others who found themselves in similar situations.

Heuermann, 60, of Massapequa Park, was charged with the murders of six women: Melissa Barthelemy, Megan Waterman, Amber Lynn Costello, Maureen Brainard-Barnes, Jessica Taylor and Sandra Costilla. Heuermann has pleaded not guilty to multiple counts of first- and second-degree murder in connection with their deaths.

The cases span 30 years, from Costilla’s death in 1993 to Heuermann’s arrest last July. Each of the women was linked to sex work, according to prosecutors.

Janon Fisher contributed to this story.