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Over the person doing the shooting, and that the clothing is 2 to 4 inches away from the person firing. >> reporter: di maio countered the medical examiner's testimony for the prosecution who said martin could have survived and suffered up to ten minutes after she was shot. di maio said shot in the heart, martin would have been unconscious in 10 to 15 seconds. >> he's going to be dead within 1 to 3 minutes after being shot in this case. >> reporter: finally, demayo testified that zimmerman's injuries fit his account saying his review of photographs indicated zimmerman's head suffered at least ...

>> reporter: he also countered the medical examiner's testimony for the prosecution who said martin could have survived and suffered up to ten minutes. >> he's going to be dead within one to three minutes after being shot in this case. >> reporter: finally, he testified that zimmerman's injuries fit his account, saying his review of photographs taken that night indicated zimmerman's head suffered at least six impacts. >> is this injury consistent with mr. zimmerman's head having impacted a sidewalk? >> yes. >> reporter: the prosecution jumped on a key question that the defense expert couldn't ...