There won’t be an eighth.

Accused Gilgo Beach serial killer Rex Heuermann , who is charged in the gruesome murders of seven young sex workers on Long Island, has been cleared in the strangulation death of an eighth woman.

DNA testing determined that Heuermann was not tied to the 1994 slaying of Colleen McNamee, who was beaten, strangled and dumped near the William Floyd Parkway in Shirley, according to records from the Suffolk County Medical Examiner’s Office reviewed by The Post.

“A comparison between Cybergenetic’s developed profile, ‘unknown male A’ and the DNA profile of Rex Heuermann was performed,” the Oct. 21 coroner’s report said.

“Assuming that the ‘unknown male A’ profile is a mixture without any allelic dropout and strictly based on possible genotypes present in the profil

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