A "faulty exhaust system component" may have caused exhaust to enter the idling vehicle where two Drayton Valley teens were found unconscious last week, Alberta RCMP said Thursday.

A second teenager has died after he and another teen were found unconscious in an idling vehicle in central Alberta.

Alberta RCMP say they do not suspect foul play in the sudden death of a 16-year-old girl in Drayton Valley. Officers are not searching for any suspects and hope a vehicle inspection will shed light on the tragic incident, that also left a 17-year-old boy in critical condition.