A 23-year-old engineer was found dead and a teenaged girl, with whom he had a relationship, unconscious in a car in Outer Delhi early on Saturday morning, police said.
Dinesh Gupta and the 17-year-old girl got trapped inside the car with its AC on after the vehicle ran out of petrol in Punjabi Colony of Narela at around 12.30 am, a senior police official said.
"They could not open the door before carbon dioxide got filled inside the car. After sometime Gupta managed to open the doors. In a semi-conscious state he came out, but fell down resulting in his death," the official said.
The girl, a student, survived the incident as Gupta opened the doors and oxygen supply was restored, he said.
She is recuperating in a hospital. Both are residents of Punjabi Colony in Narela.
Gupta works as a junior engineer in Sonepat-based T D India company.
His body has been sent for post mortem.