>> just, there's gunshots. >> and to identify them. >> ma'am, that screaming or yelling, do you recognize that? >> yes. >> and who do you recognize that to be, ma'am? >> trayvon martin. >> reporter: jurors heard testimony from martin's older brother and the medical examiner who stated trayvon martin lived one to ten minutes after being shot. when the defense took the reigns late friday, they called george zimmerman's uncle and mother to the stand who also testified about the 911 call screams. >> do you know whose voice that was screaming in the background? >> yes, sir. >> and whose voice was that? >> my son george. >> reporter: both mothers swear ing that voice belongs to their son and a jury who must decide who is correct. other stories making news this morning, last night fire officials said two tankers from