Rex Heuermann, accused of multiple murders, contests DNA evidence in court, with his defense questioning the scientific acceptance of the forensic techniques used.

The New York architect facing murder charges in a string of deaths known as the Gilgo Beach killings on Long Island is challenging the DNA evidence against him and is seeking separate trials in the sprawling case.

RIVERHEAD, N.Y. -- Suspected Gilgo Beach serial killer Rex Heuermann is scheduled to return to court Wednesday on Long Island. The 61-year-old is charged with the murders of seven women dating back to the 1990s .

Suspected Gilgo Beach serial killer Rex Heuermann is seeking as many as five separate trials for the seven murders he is charged with.

A judge on Wednesday scheduled hearings to hear arguments from lawyers who want accused Gilgo Beach serial killer Rex Heuermann to receive five separate trials. Judge Timothy Mazzei will also hear from both sides to determine how much of the prosecution’s mountain of evidence against Heuermann will actually be admissible in court.

Accused Gilgo Beach serial killer Rex Heuermann appeared before a judge Wednesday on Long Island. Heuermann's attorneys argued over the admissibility of DNA testing and are pushing to hold as many as five trials.