The only non-white juror in the trial of George Zimmerman has claimed that the neighbourhood watchman, who killed teenager Trayvon Martin, got away with murder.

Juror B29, known only as Maddy, admitted that she was the only member of the six-woman jury who originally voted to find Zimmerman guilty of murder while fellow jurors were divided between non-guilty and manslaughter.

"George Zimmerman got away with murder, but you can't get away from God," she said during an ABC News interview. "And at the end of the day, he's going to have a lot of questions and answers he has to deal with."

Zimmerman was found not guilty of murder and manslaughter in Sanford, Florida after jurors accepted his claim that he shot 17-year-old Trayvon in self-defence.

But 36-year-old Maddy suggested that the trial had been little more than a publicity stunt. Florida laws never provided an opportunity to convict, she claimed.

She admitted that she initially voted to convict Zimmerman, 29, of second-degree murder but made a U-turn after nine hours of discussing evidence on the second day of deliberations.

"That's where I felt confused," she said.

"For myself, he's guilty because the evidence shows he's guilty. But as the law was read to me, if you have no proof that he killed him intentionally, you can't say he's guilty.

"I was the juror that was going to give them the hung jury. I fought to the end."

The Puerto Rican mother-of-eight said felt she owed an apology to the victim's parents, Sybrina Fulton and Tracy Martin.

"I felt like I let a lot of people down, and I'm thinking to myself, 'did I go the right way? Did I go the wrong way?'" she told Robin Roberts on ABC News' Good Morning America programme.

The verdict brought thousands of people out on to the streets in protest in cities across the US.