We begin with the powerful testimony today at the George Zimmerman trial. Sopowerful that some, including Trayvon Martin's parents, could not bear to hearit. It centered on what happened in the seconds and minutes after defendantGeorge Zimmerman shot Trayvon Martin as Martin lay dying.

It was, by no means, the only big moments today. There were others includingthe legal battle over what the prosecution considers a linchpin(??£»??) of itscase. But the testimony from the police sergeant who tried to revive or atleast stabilize the wounded Martin packed a serious punch.

Martin Savidge joins us now live. Martin.

Now, Anderson, this was an extremely difficult day. You know, this was a daythat took the jury, took the entire courtroom back to that fateful night, andthat would be February 26th, 2012, and this was the first time in a number ofways we've heard the story.

Remember, you know, the jury is hearing this essentially for the first time andthey've seen George Zimmerman. They know he's the defendant. They've heard thename Trayvon Martin, but today they saw the body of Trayvon Martin and that hadtremendous impact in the courtroom.

You saw a teenager laying on the ground, and of course, you knew the fact thathe was dead. George Zimmerman admits to shooting him. It's whether it wasself-defense or murder as the prosecution is trying to portray. So the imagerywas strong but even stronger, it was the first responder who showed up on thescene moments after the shooting and he's trying to revive this young teenagerwith the help of another officer.

Here is some of what went on in court today.

Day two of George Zimmerman's murder trial took the courtroom back to thattragic night of February 26th, 2012. For the first time, jurors saw the body ofthe teenager Zimmerman killed, Trayvon Martin, and listened to graphictestimony from one of the first police officers on the scene, who, with anotherofficer, tried to revive the teen.

After you rolled his body over onto his back, did you again try to get a pulse?

Yes, sir, I did.

And were you able to get a pulse?

No, sir, I was not.

What was your role in that, the CPR attempts on Trayvon Martin?

I was doing breaths, sir.

In the courtroom just a few feet away, Martin's mother sat stoically listeningto the last moments of her son's life.

And did rescue take over the CPR efforts after they arrived?

Yes, sir.

What did you see the rescue personnel do to treat or assess Trayvon Martin?

I watched them hook up the leads of the AKG machine to Mr. Martin, sir.

And was Trayvon Martin pronounced dead by rescue at the scene?

Yes, sir.

Also taking the stand, the crime scene technician who took pictures andgathered evidence around Martin's body and examined the gun Zimmerman used toshoot the teenager. She also photographed Zimmerman's injuries, which thedefense says were a result of a vicious attack from Martin.

Do you see that sort of lump on the top right of his head?

Yes, I can.

And you saw it that night, too, right?

Yes, I did.

Did you see that lump on the top of his head?

Yes, I do.

The top right side, and you saw it that night, as well?

That is correct.

Also, shown at the courtroom was the hoody sweatshirt Martin was wearing whenhe died. To many it's become a symbol of racial profiling that has elevatedthis case to a national debate.

Earlier in the day with the jury out of the courtroom, the defense andprosecution fought over phone calls, specifically calls Zimmerman made topolice prior to that fatal night. Police records showed Zimmerman made dozensof calls over the years reporting things he found suspicious.

The state wants to introduce six from the six months prior to Martin's death inan effort to portray Zimmerman as increasingly frustrated at seeing people heperceived as suspicious eluding police. The state contends Zimmerman followed17-year-old Trayvon Martin to make sure he wouldn't get away.

The last witness on the stand said she saw two people standing upright andfighting that night. Potentially more damaging to the defense, she said sheheard a sound like running from left to right, possibly implying a chase. Itwas a detail she hadn't previously mentioned according to police transcripts.