Rex Heuermann, 59, architect and father of two, was detained on Thursday and charged on Friday with killing three women more than 10 years ago: Melissa Barthelemy, Megan Waterman, and Amber Costello. He is also being looked into as the prime suspect in the death of Maureen Brainard-Barnes.

On Saturday, forensic police investigators from several agencies, including the New York State Police, could be seen removing several objects, including a massive filing cabinet, from the Long Island house of alleged serial killer Rex Heuermann.

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“We’re just going through his house looking to see if there’s any evidence,” a police source told The Post of the search of the alleged killer’s home. “If he has any trophies.”

Police are still taking rifles and other evidence from the house. Cops also removed a child-sized, fair-haired doll that had been preserved in a sizable wooden and glass display from Heuermann’s childhood home.

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Two detectives are seen in photos of the incident carefully removing the doll from the crumbling home while wearing gloves. The doll has long hair that was braided numerous times and appeared to be blonde. Its head was topped with a red ribbon, and it was dressed in crimson. The casing, which was etched with flowers, gave the impression that the object was somehow posed inside.

As they searched the run-down house, law enforcement hauled boxes of stuff away, including the doll, cat food, a cat scratching pole, a framed photo, and an empty bookcase.

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In addition, officers wearing hazmat suits were observed hauling red cups, sugar-free cough drops, and a gumball machine in large, transparent trash bags. Two officers carried a massive object that was entirely wrapped in moving blankets, while another officer carried a painting that appeared to be a fighter jet.

Investigators repeatedly loaded blue bins with objects from the house before emptying the bins into a truck while wearing hazmat suits, gloves, and protective headgear.