West also asked about Zimmerman's injury potential.

"If intercranial injury is severe enough, it can kill you," Di Maio said, adding that even if pounding head on concrete is not fatal, "you're going to have some stunning effect."

Di Maio's sixth attack on Bao's findings was saying that Zimmerman's cuts on his head was from separate impacts and not one, as concrete is "unyielding" surface. He said his head injury was consistent with hitting a concrete sidewalk.

The defense did not ask Di Maio about Martin's marijuana use. It's not clear when the defense will introduce the marijuana use.

During cross-examination, prosecutor Bernie de la Rionda discussed with Di Maio if he could say who started the fight or if there was a first punch. Di Maio said he's not saying Zimmerman spoke the "gospel truth."

De la Rionda, apparently aware of a jury full of animal-lovers, asked Di Maio about the animals that were shot during testing. He then asked Di Maio how much he was getting paid, which was up to $400 an hour and $2,400 up to Monday.

Di Maio said he can't identify who was screaming or if Zimmerman took the gun from holster as he claims. Di Maio also said Zimmerman's wounds aren't consistent with face-to-face shooting, even if the shirt was pulled, because the defects wouldn't line up as the do now. Di Maio did say it could be consistent with Martin pulling away from a top position just before the shot was fired.

The state suggested the head injuries on Zimmerman could have come from cutting his head on tree branches, to which Di Maio conceded one of the head injuries could have come from trees.

"You're not saying he could die from that are you?" de la Rionda asked.

"Oh no I never said that ... indicative of a hard impact," Di Maio said.

Di Maio then said someone who touched Zimmerman should have blood on their hands. Martin did not have blood on his hands.

"Police in this case should have taken Mr. Zimmerman to the hospital," Di Maio said. "You don't mess around."

The defense should pictures of blood around Martin's nipple at the scene but not in autopsy photo, speculating someone cleaned it. The state objected, which Nelson sustained.

On recross, the state showed how the blood around the nipple could have ended up inside the sweatshirt and not cleaned up.

Di Maio said he disregarded the witness statements in his analysis.

"The witnesses they're all over the place, "Di Maio said. "You can't use the witnesses to make autopsy decisions."

Before Di Maio's was brought in, Judge Debra S. Nelson inquired of Zimmerman if it was OK for his attorney, former Local 6 legal analyst Mark O'Mara, to "carve out" certain parts of DiMaio's testimony.  Zimmerman said it was.

Before testimony started on Tuesday, a hearing was held to determine if Zimmerman's attorneys can show a computer-animated reenactment of the shooting of Martin. The defense called the Daniel Shoemaker, the man who specializes in crime scene reconstruction. Another witness will also be proffered.

It's become a top goal of lawyers to convince jurors of whether he or Trayvon Martin can be heard on a 911 call. Defense attorneys called five of Zimmerman's friends Monday to testify that it was his voice yelling for help on the call.

On Monday, Zimmerman's attorneys also called two police investigators who contend Martin's father, after hearing a recording of the call, initially said it wasn't his son.

Martin's father, Tracy Martin, came to the witness stand, and he denied ever saying the screams for help weren't his son.

Convincing the jury of who was screaming for help on the tape is important to both sides because it would help jurors evaluate Zimmerman's self-defense claim.

Zimmerman has pleaded not guilty to second-degree murder in the death of Martin, who was shot and killed in a gated Sanford community in February 2012.

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