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It was a major development. karen's ex had suddenly gone from being a prime person of interest to a victim himself. victim of the real killer who tried to frame him for the crime and was still out there somewhere. whoever killed her know somebody named roc. >> somebody knows my name. >> that's a part of the story. >> that's right f. you think about this, this is -- it's not even a smart thing to do. >> reporter: roc was right. the pool of suspects had suddenly narrowed to a small handful of karen's intimates who knew about him and knew the unusual way he spelled his name. roc. detectives holbr...

Into actual support at the ballot box? >> it's a big question. you've been talking and great reporting there, too, to a number of people in the african-american community and important to point out this is not a monolith. you don't have all of them in support of one candidate or not and generationally there is a big breakdown in terms of a divide over those that support biden and those that don't. >> reporter: yeah. that's right f. you look at the poll that we released last week, it found that the majority of his support among black voters comes from older voters, voters over the age of 50 sup...

An announcement on saturday? >> reporter: that's right f. i had my crystal ball in front of me i might be able to give an answer that nobody appears to havetive. it's a little like brexit, we don't know why it's going. really, i have to say, not only are we looking at so many people without paychecks and the numbers of stories we are hearing surrounded what's been created, made up as a crisis which simply doesn't exist on the border, but there is no foreseeable way future. looking over here at london, i have to say, it's tremendously damaging for america's leadership or its standing in the wor...

Hour-and-a-half away. >> you went over these alleged beefs he might have had with her when they were boyfriend, girlfriend? >> he had moved on. >> the detectives were able to move on, too. they officially cleared roc. it was a major development. karen's exhad suddenly gone from being a prime person of interest to a victim himself. victim of the real killer who tried to frame him for the crime and was still out there somewhere. whoever killed her know somebody named roc. >> somebody knows my name. >> that's a part of the story. >> that's right f. you think about this, this is -- it's not even a...

Investigation. >> that's right f. you see what happened in the last half hour, you can see why the fbi is involved. it not a question of if this is a terrorist incident, it's the complex itititys the fbi will b fanning out across different city, different locations, you got to look already at mountains of data. not only if this person has a social media presence, what phone numbers he's used, whether he's traveled internationally. >> that requires a lot of capability that both the police here in new york can bring to bear, but also the fbi when this investigation moves out of new york city. >>...