Gilgo Beach killer pleads guilty

The stunning admission in the Gilgo Beach case comes after DNA evidence and a massive multi-agency investigation led to Heuermann's arrest last year.

As part of his plea deal, the serial killer has agreed to be interviewed by FBI behavioral analysts to help solve other cold cases.

The victims' families expressed a mix of relief and sorrow as the details of the 'suburban dad's' secret life were laid bare.

Heuermann will spend the remainder of his life in prison without the possibility of parole, ending one of New York's most notorious criminal sagas.