The 32 year-old Hillcrest man arrested Saturday in the shooting murders of two Valley Cottage women is described by police as the former domestic partner of one of the victims, but it’s not clear whether he is the father of the baby who was left motherless. Clarkstown Police say Robert Williams III was arrested Saturday and charged with two counts of second-degree murder and other charges. In a press conference yesterday police chief Ray McCullogh would not say whether a murder weapon had been found. 63 year-old Wanda Castor and her 27 year-old daughter, Kathleen Castor, were killed in their home May 26th. The child, one-month old Anastasia, is now in the care of Child Protective Services. Williams is being held in the Rockland County Jail and is due back in court Thursday. The Clarkstown Police Detective Bureau asks anyone with information to contact them directly at 845-639-5840.