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A fourth woman, Maureen Brainard-Barnes, was found in the same spot, alongside the other victims, and Mr. Heuermann is also the prime suspect in her death, according to the bail application from the Suffolk County District attorney’s office on Friday.

The investigation into her death “is continuing and is expected to be resolved soon,” the prosecutors wrote.

Mr. Heuermann, an architect who has lived most of his life in Nassau County and worked in Manhattan, on Friday pleaded not guilty to murder in the case of the first three victims and was ordered held without bail.

The four women were found when investigators began looking for Shannan Gilbert, a 24-year-old from Jersey City, N.J., who worked as an escort and was reported missing on Long Island in May of 2010. She disappeared while visiting a client in Oak Beach, three miles from Gilgo Beach.