A Chelsea man died Thursday following an apparent drug overdose inside a car that prompted a hazmat response. An unconscious man was found in a car in Cary Square on Thursday afternoon. Narcan was used and the 44-year-old man was transported to Whidden Hospital but did not survive. White powder was found in the car. Firefighters believe it could be the potentially lethal drug fentanyl, but don’t know yet. “It could be anything. We have no idea right now,” said Dep. Fire Chief Wayne Ulwick.