Old Lyme — The death of an infant found at a Portland Avenue house last week does not appear to be criminal in nature, according to state police.

State police spokesman Tyler Weerden said the investigation into the 6-month-old child’s death has not been completed, but that the incident was likely “non-criminal.”

State police and medical responders responded to a home near the Soundview Beach neighborhood on Aug. 14, where they found the child unresponsive. The child was taken to Middlesex Shoreline Clinic and pronounced dead there.

Detectives from the state police Central District Major Crime Squad, who investigate all deaths that are not witnessed by anyone, took over the case to rule out foul play, Weerden said.

“Due to the fact that this death was unattended/not observed by anyone, they’ll get involved to do a full investigation as a precaution,” he said in an email.