Yes, there was an autopsy. Nancy Grace said so last night, and it was confirmed by the funeral director.
http://www.nypost.com/p/news/national/trayvon_martin_funeral_director_DItBKrvBY6dlsGi5HD9bWL
Richard Kurtz told CNN's Nancy Grace on Wednesday that Martin had a gunshot wound to his upper chest, but any other injury would have been difficult to detect because an autopsy was performed on the teen's body before he received it.
"As for his hands and knuckles, I don't see any evidence he had been fighting anybody," Kurtz said.
A Volusia County spokesman, Dave Byron, has confirmed that an autopsy was performed by them, but those results could take more than 30 days to be released. Results will not be unsealed until the investigation becomes "inactive."