A Suffolk judge will decide Tuesday if accused Gilgo Beach serial killer Rex A. Heuermann will face a single trial for each of the seven alleged killings in the high-profile case.

State Supreme Court Justice Timothy P. Mazzei also is expected to make a new determination on the admissibility of hair DNA evidence and could set a date for trial when Heuermann appears in court Tuesday, he previously indicated.

The defense in the case has sought to split the first- and second-degree murder case into as many as five trials.

A defense motion filed in January argued that a "substantial disparity" exists between the evidence in the first indictment — charging Heuermann with first- and second-degree murder in the killings of Melissa Barthelemy, Amber Lynn Costello and Megan Waterman — and the

See Full Page