Judge orders DNA sample from Gilgo Beach murder suspect Rex Heuermann

Suspect Rex Heuermann was ordered by a judge to provide a DNA sample, despite objections from his defense.
Heuermann is charged with three murders and is the prime suspect in a fourth.
Prosecutors believe DNA evidence links Heuermann to the crimes, including traces found on a pizza crust.
Heuermann's DNA will be compared to evidence from the crime scenes.
The investigation into the Gilgo Beach murders remains ongoing, with police unable to rule out another serial killer.