The first witness from the neighborhood where George Zimmerman shot Trayvon Martin took the stand Tuesday.

Even though Selene Bahadoor was called to the stand by the state, her testimony may have actually have been better for the defense.

Our legal analyst, Mark NeJame, says the fact that she did an interview for national TV and signed a petition on Facebook claiming Zimmerman was a killer could have significantly hurt her credibility.

"She's anything but unbiased, and anything but the shy, soft-spoken, witness that she initially presented to be," NeJame said. "And that's what good cross-examination is for, and that's why our Constitution has 'you're entitled to confront your witnesses.' Why? Because witnesses are simply not always forthright."

Although the witness's credibility might have been damaged, NeJame does not believe that there was any evidence of perjury in her testimony.

On Tuesday, the jury was also shown several pictures of Martin's body the night he died.

NeJame says showing photos of a victim's body is not out of the ordinary during a criminal trial.

"In every homicide case, there are going to be pictures of the deceased, and this case is no different," NeJame said. "There is a body of case law that allows gruesome or inflammatory pictures not to be necessarily shown, but none of these pictures rise to that level."

During the time the pictures were shown, Trayvon's father, Tracy, left the courtroom.

Trayvon's mother, Sybrina Fulton, remained in the courtroom but seemed to look away from the screen.