Rex Heuermann, 62, who gave his own brief statement in court, was sentenced to consecutive life sentences in prison.
Rex Heuermann attended a conference hearing, where his lawyers replied to the Suffolk County prosecutors' opposition to their attempts to try the murders separately.
So far, nine different defendants are facing a litany of charges in the case of a 14-year-old East Patchogue girl who went missing back in December.
Heuermann's lawyers say the method used to collect hairs found at six separate crimes scenes is unreliable.
District Attorney Ray Tierney called the schedule "ambitious" because of the large amount of evidence amassed in the case accusing Rex Heuermann of six murders.
Prosecutors said her blood tested positive for methamphetamines, which her lawyer says is prescribed.