Ayala says he arrived so quickly on scene that the other officer still had Zimmerman at gunpoint. He says this is protocol if shots have been fired.
[Updated at 2:06 p.m. ET]
Prosecutor Guy has concluded his direct examination. Now defense attorney O'Mara has started his direct examination.
[Updated at 2:05 p.m. ET]
"At any time, did you see any signs of life from Trayvon Martin's body?" asked prosecutor John Guy.
"No, sir," said Ayala.
He was performing chest compressions. Eventually, he says, emergency personal arrived and pronounced Martin dead on the scene.
[Updated at 2:04 p.m. ET]
Ayala worked with another officer to roll Martin's body over.
"Underneath -- he had a pin or button -- it was underneath the button," said Ayala about the gunshot wound.
Ayala and another officer started CPR on Martin.
[Updated at 2:02 p.m. ET]
Ayala says he was the first officer to approach Martin, who was face-down with his hand beneath him.
"I asked to see his hands," said Ayala. Martin didn't respond physically or verbally to his commands. He didn't see any movement or hear any sounds from the body.
[Updated at 1:59 p.m. ET]
The prosecution has called Ricardo Ayala, a police officer with the Sanford Police Department, to the witness stand. He responded to the shooting that night. He demonstrates on a map where he entered the neighborhood and where he parked.
[Updated at 1:55 p.m. ET]
The defense has no more questions, and Manalo is being excused.
[Updated at 1:54 p.m. ET]
Manalo says he didn't see the actual shooting take place and can't say if it's self-defense. The prosecutor has finished his redirect examination.
[Updated at 1:53 p.m. ET]
The prosecutor again asks about Zimmerman's demeanor.
"Coherent, compliant -- he wasn't ... he was calm. He was staggering a little bit," said Manalo.
[Updated at 1:52 p.m. ET]
Defense attorney West has wrapped his cross-examination. Prosecutor de la Rionda is now asking more questions.