Accused Gilgo Beach serial killer Rex A. Heuermann will face a single trial for all seven alleged killings, a Suffolk judge ruled Tuesday.

State Supreme Court Justice Timothy Mazzei informed attorneys for both sides during a brief conference in Riverhead that he ruled against a defense request to split the cases into multiple trials.

Mazzei also determined for the second time that nuclear DNA evidence in the case will be admissible at trial, denying a final push by Heuermann’s defense to exclude the DNA because an outside laboratory lacked New York State Department of Health permits.

Suffolk County District Attorney Ray Tierney described the judge’s decisions as victories for his office, which he said properly joined each of the killings in a single superseding indictment because they

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