Suffolk County prosecutors can use high-tech DNA evidence against accused Gilgo Beach serial killer Rex Heuermann — who will face just one trial for the murders of seven sex workers, a Long Island judge said in a bombshell ruling Tuesday.

The decision by Judge Tim Mazzei is a slam dunk for Suffolk County DA Ray Tierney, whose case against Heuermann hinges largely on DNA.

“If I wasn’t confident in this case, I would’ve never brought it to trial,” Tierney told reporters. 5

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Heuermann’s lawyer, Michael Brown, had challenged the DNA evidence and sought to have his client tried separately for each of the seven sex workers he is accused of killing.

Mazzei ruled earlier this month that crucial DNA evidence could be used in the case against the 61-year-old accused serial killer — the ke

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