By Holly Yan, CNN
updated 12:36 AM EDT, Tue August 26, 2014
In the recording, a quick series of shots can be heard, followed by a pause and then another quick succession of shots.
"I personally heard at least 11" shots, the man's attorney, Lopa Blumenthal, told CNN's Don Lemon.
The man, who asked that his identity not be revealed, lives near the site of the shooting and was close enough to have heard the gunshots, Blumenthal said.
He was speaking to a friend on a video chat service and happened to be recording the conversation at the same time Brown was shot, Blumenthal said.