A Good Samaritan has lost his life after coming to the aid of a driver who had run out of petrol in Melbourne's southeast.
Jayden Lynch Cooper collapsed while helping to push the man's car and died in the middle of the road outside his Pakenham home.
A passing motorist discovered the 20-year-old's body in Kosta Boda Boulevard at about 10pm on Tuesday and called triple 0.
Paramedics performed CPR for 40 minutes but the young man could not be revived.
Neighbours say they did not hear anything until emergency services descended on their usually quiet suburban street.
"I was about to get ready to go to bed and the whole house was lit up with police lights," one neighbour said.
The homicide squad interviewed the car owner and took away his station wagon for testing.
A postmortem found that Jayden had suffered a seizure, brought on by a heart condition while helping push the car along the street.
It is believed nobody stopped to help him when he collapsed.
Social media has been inundated with tributes for the young man who finished top of the class at Lyndhurst Secondary College when he graduated three years ago.