An infant who died in Lexington this week may have been inside a car for an “extended period of time,” according to investigators.

Middlesex District Attorney Marian Ryan and Lexington Chief of Police Michael McLean confirmed on Thursday that the investigation into the infant’s death remains ongoing.

Police officers on Tuesday at around 5:30 p.m., responded to a Massachusetts Avenue daycare parking lot for the report of an unresponsive infant inside his mother’s vehicle.

The child, who would have turned 1-year-old on Aug. 31, was transported to an area hospital — where he was pronounced dead.

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“The preliminary investigation suggests that the child had never entered the daycare on the day of his death and that he may have been in the car for an extended period of time,” officials said in a statement.

The case has been referred to the Office of the Chief Medical Examiner, who will determine the cause and manner of death.