Fresh evidence into the death of Trayvon Martin appears to strengthen his killer's claim to have only opened fire in self-defence after being attacked by the unarmed teenager.
According to a new witness, the 17-year-old overpowered George Zimmerman for at least part of their struggle and pinned him to the ground in moments before the killing.
"Where I first walked out there, the black guy was on top and the only reason I can tell that was because the guy that was on the ground under him at that point wrestling was definitely a lighter color," the witness said in an interview with Florida prosecutors.
Zimmerman, who is awaiting trial on a charge of second-degree, was found to have suffered injuries to his nose and the back of his head by medics who examined after the shooting in February.
The wounds are consistent with the 28-year-old's claim that Martin threw him down and repeatedly bashed his head against the pavement as they fought on a residential estate in Sanford, Florida. Martin was also found to have a slight injury to his hand, as if he had struck something.
However, prosecutors also released a damning report by police, which concluded that Martin's death was "ultimately avoidable" if only Zimmerman had not confronted the teenager as he returned from buying sweets.
In the report, written two weeks after the killing, officers urged prosecutors to take Zimmerman into custody and said there was "no indication" Martin had taken part in any criminal activity prior to the confrontation.
Martin's girlfriend also told prosecutors that he yelled "get off, get off" in the moments before his phone went dead. The girl said that Martin sounded breathless and scared but managed to briefly evade Zimmerman before being cornered close to his father's home.
A separate autopsy report showed that Martin had traces of cannabis in his system at the time of his death.
Forensics investigators also concluded that the Zimmerman fired from an "intermediate range" of less than three feet.