The unarmed black teenager killed by a police officer in Ferguson, Missouri, on 9 August was shot at least six times, including twice in the head, a medical examiner has said.
Dr Michael Baden was hired to perform a second, independent autopsy by the family of Michael Brown, 18. The family have called for the arrest of the officer who killed Mr Brown.
Mr Brown's death has sparked days of unrest and clashes between protesters and police in the St Louis suburb.
The officer who shot Mr Brown, Darren Wilson, has been suspended with pay since the shooting, and Mr Brown's family have called for his arrest and prosecution.
As the unrest, marked by a crackdown by riot police wielding tear gas and rubber bullets, has continued, on Sunday Missouri Governor Jay Nixon ordered the National Guard to the town to "help restore peace and order".
On Monday, lawyer Ben Crump said Mr Brown's family had asked Dr Baden to perform an autopsy as they "did not want to be left having to rely on the autopsy done by the St Louis law enforcement... the same individuals they feel are responsible for executing their song in broad daylight".