FARMINGDALE - Police say they've found the remains of a 15-month-old boy in Farmingdale following an investigation by Suffolk County Child Protective Services. Authorities say they found the body of a baby believed to be Justin Kowalczik, who would have been 3 years old by now. The remains were found buried in the backyard of 1 Hallock Road, a residence shared by the child's mother, Heather Kowalczik, and her boyfriend, Robert Rodriguez. Kowalczik and Rodriguez have a 6-year-old child and a 9-year-old child together. Justin was not Rodriguez's son. The family moved into their Farmingdale home about three years ago from Orange County. The landlord says he did not see a baby when they moved in. Authorities say Suffolk County Child Protective Services did a routine check of the home Wednesday which revealed that a 3-year-old child was unaccounted for. Police interviewed Kowalczik and learned of the unreported death of her son, Justin. After Rodriguez learned he was a person of interest in the child's death, police say he took off with his 9-year-old son Robert Rodriguez Jr., sparking an AMBER Alert. Authorities found them a few hours later. The medical examiner's office is conducting an investigation into the child's cause of death.

Police say Rodriguez is not cooperating in the investigation and that no arrests have been made so far. AMBER Alert leads to arrest of suspect, child safe