FARMINGDALE - ? The Suffolk County Medical Examiner is working on determining how a baby died before being buried in the backyard of a Farmingdale home. Police say the remains of 17-month-old Justin Kowalczik were discovered by police on Saturday.

The body was hidden in the family?s yard for more than two years. The mother of the child apparently led cops to the body.

The family's babysitter says the mom, Heather Kowalczik, was afraid of the father of her two older boys.

Police say Robert Rodriguez is now a "person of interest" in the child's death. They say that Rodriguez is not cooperating in the investigation.Justin Kowalczik's death was discovered after police say Rodriguez took off with his 9-year-old son. The disappearance triggered an AMBER Alert on Friday.

Baby-sitter: Mother of boy found in shallow grave was 'afraid'Police: Child's remains found in Farmingdale