mike tyson, he's here and he's angry about the trayvon martin case. he tweeted the shooting puts us all in fear. we'll talk more about that and more with iron mike just ahead. with me for an exclusive interview, robert zimmerman, whose brother, george, killed trayvon in what he said was self-defense. robert, thank you for joining me tonight. why are you here? why do you want to do this interview? >> i think the tide has turned. there's a lot of loose ends to this story. some of them have to do with the events of that night and an investigation. some of them have moved on to a lot of hate speech, people like the mcclain family having to flee their home. people taking really -- putting emotions ahead of fact and putting our family and other families in danger. >> has your family had death threats? >> oh, yes. yes. >> credible threats? >> yes, they have, yeah. >> against more than one member? against more than george? >> you know, i'm really not at liberty to discuss exactly who was threatened or how they were threatened, but can i tell you that i, myself, have been contacted by law enforcement to -- because there was credible intelligence tha