Gilgo Beach serial killer suspect Rex Heuermann to be indicted for murdering TWO more women

Suspected Gilgo Beach serial killer Rex Heuermann is expected to be indicted in the killings of two other women, according to reports. 

Multiple law enforcement sources told CNN that the 60-year-old will face murder charges relating to the deaths of Jessica Taylor and Valerie Mack on Thursday. Other reports claimed that he was to be indicted for the 1993 killing of Sandra Costilla.

The headless and handless body of Taylor, 20, was discovered in the woods of Manorville, New York, in 2000. 

In 2011, the rest of her remains were discovered over 40 miles away near Gilgo Beach on Long Island. 

Mack had vanished near Atlantic City, New Jersey, in 2000 at the age of 24 and was also found dead in Manorville, with parts of her later discovered on Gilgo Beach. 

Heuermann, who has pleaded not guilty in the deaths of four women, will appear Thursday in state court in Riverhead.

Heuermann, who has pleaded not guilty in the deaths of four women , will appear Thursday in state court in Riverhead

Multiple law enforcement sources told CNN that the 60-year-old will face murder charges relating to the deaths of Jessica Taylor, left,and Valerie Mack, right, on Thursday

In April of this year, detectives were seen scouring woodland close to where body parts belonging to the two were found.  

Search teams with K9s were seen sweeping the wooded area in Manorville over three days. 

Last month, detectives also went back to search the alleged serial killer's Long Island home.

Officers had recovered a cache of weapons during an initial search following his arrest last summer. 

Heuermann was arrested in July and initially charged with killing Melissa Barthelemy, 24, Megan Waterman, 22, and Amber Lynn Costello 27. 

In February, he was also charged with the murder of Maureen Brainard-Barnes, 25. 

The women were found wrapped in burlap and buried along the remote stretch of Ocean Parkway on Long Island's South Shore over a decade ago.

Heuermann, an architect, has pleaded not guilty to all counts and currently remains in jail awaiting trial. A date for trial has not yet been set.

The Gilgo women's remains were discovered during the search for 23-year-old Shannan Gilbert, an escort from New Jersey who had vanished in May 2010 after making a frantic 911 call.

In April, officials searched a Manorville area where the partial remains of Taylor and Mack were found more than 20 years ago

The first victim, 24-year-old Melissa Barthelemy, was discovered by Suffolk County Police on December 11, 2010. The body of Megan Waterman, 22, from Maine, was found two days later

Heuermann is also charged with killing Amber Costello (left) and  Maureen Brainard-Barnes (right) 

Her remains were found along the same stretch of coast in December 2011 - and it was her body that led police to the discovery of the 'Gilgo Four'.

No one has ever been charged in Gilbert's death and police said it may have been accidental - but her family believe she was murdered.

The women were among 11 found on the desolate stretch of coastline close to Heuermann's Long Island Home between 2010 and 2011.

All of the victims worked as escorts who advertised themselves on Craigslist.

Heuermann was linked to the killings by DNA on the burlap used to transport the bodied which was compared to samples taken from a pizza crust and napkin that were discarded outside his Manhattan architectural firm, police said.

The samples boasted a 99.96 percent match, according to law enforcement officials.

Cops said they were alerted to Heuermann as a potential suspect after a witness linked Heuermann's Chevrolet Avalanche to Costello's murder.

The women known as the 'Gilgo Four' were discovered close to Heuermann's Long Island home. However, other bodies - including those of sex workers - have been found in the area

The car was then tied to Heuermann's cellphone records, which allegedly linked him to locations related to the murders.

The indictment stated that Heuermann had used different burner phones to contact each of his victims.

Cops also accused Heuermann of using Barthelemy's phone to make taunting phone calls to her family from the comfort of his office.

Her sister Melissa told how she was bombarded with threatening phone calls from the killer who boasted of the killing and was keeping tabs on her movements.

Vess Mitev, a lawyer for Heuermann's two adult children, said the family was closely monitoring the developments.

'The hearing is yet another mile marker in this macabre saga, where they continue to be unfortunate bystanders,' he said.