An 18-year-old man was shot dead by a man he was celebrating with at a party in the US state of Michigan, local media reported on Sunday.
The teenager was at the party with a friend when a group of people started fighting in the backyard, and the man followed them, police said.
The group had been drinking, and a fight broke out, causing a car to collide with them, the Detroit Free Press reported.
The boy was shot in the neck.
The group then fled the scene, the Free Press said.
It did not say if the victim was the person who shot him.
A preliminary investigation has been opened into the incident.