Two suspects in the Long Island body parts case were arraigned on new charges Tuesday and are being held behind bars.

Steven Brown and Amanda Wallace pleaded not guilty to the new charges of conspiracy and robbery, respectively.

Prosecutors say Brown and two other suspects planned to kill Malcom Craig Brown and Donna Conneely in February. Jeffrey Mackey and Alexis Nieves were charged with the murders on Monday.

The victims' remains were found scattered across Long Island.

Three of the suspects, including Wallace, are also charged in a gas station robbery that prosecutors say is connected to the killings.