[Updated at 2:40 p.m. ET]
Defense attorney West asks if someone who is having this happen to them would be able to know, in the moment, whether it's life-threatening or not.
"No, because they're stunned and they're in pain and fear -- you can't interpret," said Di Maio. He also says the police should have taken Zimmerman to the hospital because he had head trauma. Di Maio says if Zimmerman would have died at the police station, his family would have won a lawsuit. He says this happens all the time in prisons.
[Updated at 2:37 p.m. ET]
"The type of injury he (Zimmerman) would get would be more of a 'stunning,'" said Di Maio, not a concussion. He says most people wouldn't recognize the signs of a concussion, especially a subtle one.
[Updated at 2:34 p.m. ET]
Di Maio says they would like forensic nurses in emergency rooms in order to properly document injuries, "but nobody wants to spend the money." He also says it wouldn't be surprising at all that Zimmerman's physician assistant would have seen black eyes the next day when she examined him.
[Updated at 2:32 p.m. ET]
The two lacerations on the back of Zimmerman's head are consistent with striking against concrete, according to Di Maio. He also says Zimmerman would have to be upright, sitting, and go back violently in order to get the lacerations from a tree trunk.
"The cement is more plausible, especially when you look at the injuries on the side of the head, which wouldn't be tree trunk," said Di Maio.
[Updated at 2:29 p.m. ET]
Di Maio says the testimony of another eyewitness, John Good, is consistent with the evidence. Good said Martin was on top of Zimmerman before the shot was fired, in a "ground and pound" type of position, striking Zimmerman.
[Updated at 2:28 p.m. ET]
West is describing the testimony of another witness who said Zimmerman was on top and Martin was face-down when the shot was fired.
"No sir, it's not possible," said Di Maio. West says this is another example of a witness who had good intentions but got it wrong.
[Updated at 2:25 p.m. ET]
"I'm not going to base my opinions on the witnesses because witnesses are wrong all the time," said Di Maio. He says he bases his opinions on the evidence and facts.
[Updated at 2:24 p.m. ET]
Notes that Di Maio has with him include specific numbers, including Martin's height and weight, his BMI and the location of the gunshot wound. He also says four pages of his notes include photographs he thinks are important to the case.
"Do you need your notes to form your opinions once you have the facts before you?" asked defense attorney West.
"Oh no, no," Di Maio said.
[Updated at 2:22 p.m. ET]
Di Maio says Zimmerman was right-handed. The prosecutor has finished his cross-examination.
[Updated at 2:19 p.m. ET]
Zimmerman's account was consistent with the gunshot wound evidence, according to Di Maio. But he also agrees Martin could have been pulling away from Zimmerman as he was shot.