The son of Valerie Mack, one of the seven known female victims prosecutors said were killed by Rex A. Heuermann, has filed a wrongful death lawsuit against the accused Gilgo Beach serial killer, his ex-wife and daughter, records show.

The lawsuit, filed Monday in State Supreme Court in Suffolk County — the first known litigation brought by any of the Gilgo victims' family members against Heuermann — comes as the 62-year-old from Massapequa Park is reportedly expected to plead guilty on Wednesday to the killings that have haunted the region for more than a decade.

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