Officials on Thursday identified the toddler who died early this week in Moorhead under what police are calling suspicious circumstances.

Estyn Deronjic, 3, was found at an apartment in the 1500 block of S. Belsly Boulevard after police and first responders responded shortly after 1:10 a.m. Monday to a report that the child was not breathing, police said.

The child died soon after being taken by ambulance to Sanford Hospital, authorities said.

The Ramsey County Medical Examiner's Office's determination of what led to Estyn's death is pending toxicology results.

Fire emergency dispatch said that a female in the unit in the Stonecrest Apartments was reported to be screaming, "Breathe, baby boy, breathe!"

Police said in a statement that the boy and a young sibling had been staying at the apartment "for an extended period. They had been under the primary care of acquaintances of the biological parents."

The other child has been placed in protective custody, and the investigation was continuing.