Zimmerman Defense|Could Wrap Up Today

SANFORD, Fla. (CN) - George Zimmerman's attorneys may wrap up their defense in the murder trial today, after a day in which friends and family of both Zimmerman and Trayvon Martin said it was their loved one screaming for help on a 911 call.

Zimmerman's attorney Mark O'Mara said Tuesday that he expects to wrap up his case today.

Last week, Martin's mother Sybrina Fulton testified that she knew it was her son screaming on the tape.

Martin's father Tracy Martin testified that he did not say the voice was not Trayvon's - as police told reporters-he said in court that he could not tell, as it was a very difficult and emotional time.

"My world has been turned upside down," Tracy Martin said. "I was listening to my son's last cry for help. It's still hard to believe that he's dead."

After listening to the recording about 20 times, Tracy Martin said, he knew that it was his son's voice.

At least eight of Zimmerman's friends and family testified that it was Zimmerman heard on the call screaming.

His former neighbor Eloise Dilligard, testifying Tuesday via Skype, said she saw Zimmerman right after the shooting. She said he looked disfigured and had a bloody nose.

Dilligard said she recognized the voice on the call as Zimmerman.

Medical examiner Dr. Shiping Bao, who performed Martin's autopsy, testified Friday that Martin was alive from one to 10 minutes after the shooting.

Dr. Vincent Di Maio, the defense's first witness on Tuesday, said Martin was alive from one to three minutes after the shooting, and could still talk.

Zimmerman claims Martin said, "You got me," after he shot the single bullet.

Di Maio said the muzzle of Zimmerman's gun was 2 to 4 inches from Martin's body, not 0.4 inches to 4 feet away, as Bao estimated.

Di Maio testified that Zimmerman's injuries were from separate impacts, and were consistent with hitting concrete.

The injuries also could have come from cutting his head on tree branches, Di Maio said. "I'm not saying he [Zimmerman] spoke the 'gospel truth.'"

Also last week, Adam Pollock, owner of the gym Zimmerman visited to learn mixed martial arts-style fighting, said Zimmerman was overweight when he started coming, but got in shape attending the classes three times a week.

Pollock demonstrated the "ground and pound" move, and said gravity works for you when you're on top. He said punches from above carry more force.

He said Zimmerman wanted to learn boxing, but wasn't skilled enough to be in the ring.

A hearing was held before court Tuesday to determine if a computer-animated reenactment of the shooting could be shown to the jury.

Prosecutors said the reenactment is inaccurate and may confuse jurors. The animation depicts Zimmerman's account of the fight.

Defense attorneys want to introduce Martin's text messages and photos that deal with fighting and guns.

Daniel Shoemaker, a specialist in crime scene reconstruction was called.

O'Mara proffered a computer forensics expert after court Tuesday

Seminole County Judge Debra Nelson has not yet made a decision.

Nelson ruled the jury will be able to hear about toxicology reports that THC was in Martin's system the night he was shot. THC - tetrahydrocannabinol - is an active ingredient in marijuana.

Defense attorneys claim the THC could have had an effect on Martin's behavior. It could support Zimmerman's claim that Martin was "on drugs or something," as he said in a non-emergency call.

Zimmerman, 29, claims he killed 17-year-old Martin in self-defense under Florida's "stand your ground" law. He is charged with second-degree murder and could face life in prison if convicted.

Testimony continues today.

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