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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The case of the shooting of unarmed black teenager Trayvon Martin may have shocked America, but it is not an isolated incident.
President Obama has said the killing of an unarmed black teenager by a neighbourhood watch officer is a 'tragedy.'
The parents of Trayvon Martin are demanding justice after the unarmed teenager was shot dead in Florida by a neighbourhood watch guard.