The father of a neighbourhood watch volunteer who killed an unarmed black teenager in Florida, insists his son had received a death threat.
28-year-old George Zimmerman shot Trayvon Martin dead in what he said was self-defence after claiming he had been attacked.
His father, former judge Robert Zimmerman, gave an interview to local TV news station Fox 35, played out on CNN, but asked that his face not be shown.
He insisted that Trayvon had been beating his son when he was shot.
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