He's the witness for the prosecution who could turn out to be a gift for George Zimmerman's defense.
Neighbor Jonathan Good told the jury he saw two men in a tussle on the ground right outside his home in Sanford, Florida.
An attorney said, 'The person you now know to be Trayvon Martin was on top, correct?"
"Yes," said Good.
He said the person on top was wearing dark clothes.
"How about the clothing on the bottom?" asked the attorney.
"I believe it was light or white or red," testified Good.
Zimmerman was wearing a red jacket, as seen in surveillance footage shot that night.
Good said the man on top was in a so-called "ground and pound" position, a phrase used in mixed martial arts.
Good: "It looked like there were strikes being thrown, or punches being thrown."
Attorney: "The guy in the red was always on the bottom, correct?"
Attorney: "That never changed?"
Good: "That never changed."
And there's a new controversy involving that other key witness, Trayvon's friend Rachel Jeantel.
The 19-year-old student raised eyebrows with her demeanor during her two days of testimony. At one point during her testimony, she responded to an attorney's question with, "That's real retarded, sir."
Now, Olympic athlete Lolo Jones is comparing Jeantel to Madea, the larger-than-life movie character played by Tyler Perry.
Jones tweeted: "Rachel Jeantel looked so irritated during the cross-examination that I burned it on DVD and I'm going to sell it as Madea Goes To Court."
The comment is triggering an uproar.
"You must have lost your mind," one of Jeantel's supporters responded.
Another said, "You suck at track but you are awesome at saying the wrong thing."