More charges will be filed this week against suspected Gilgo Beach serial killer Rex Heuermann

The case against suspected Gilgo Beach serial killer Rex Heuermann is gaining momentum, as sources confirmed to News 12 that more charges are expected against him this week.

The father of two from Massapequa Park is charged with the premeditated and wanton murder of Melissa Barthelemy, Megan Waterman and Amber Costello. He is also accused of the premeditated murder of Maureen Brainard-Barnes.

Police are still investigating six other sets of remains discovered near Gilgo Beach in 2011: an unidentified Asian man, an unidentified mother and toddler, and the partial remains of Karen Vergata, Valerie Mack and Jessica Taylor.

Last month, investigators made a surprise return to Heuermann's home to search it for a second time. The search lasted nearly a week, and officers were seen taking several boxes of possible evidence.

In April, police searched an area in Manorville where body parts of Mack and Taylor were discovered more than two decades ago.

In 2000, police found Mack's torso near Halsey Manor Road. Three years later, Taylor's torso was discovered just a mile away. The two women became part of the Gilgo Beach murder investigation when police found more of their remains along Ocean Parkway in 2011.

Law enforcement experts said these victims could change the course of the investigation.

“The victims were dismembered, so that could lead to entirely different charges. That means they'll also be looking at other murder cases that could link them to Rex,” said Michael Alcazar, a retired NYPD detective and adjunct professor at John Jay College of Criminal Justice.

When asked if the recent searches of Manorville and Heuermann's home led to the new charges, Suffolk County District Attorney Ray Tierney said, “There were a number of necessary investigative steps that were taken. You've outlined just a few of them, and on Thursday you'll see the fruits of that investigation.”

Heuermann's wife, Asa Ellerup, is not expected to appear in court Thursday. Her attorney said she is still out of state.