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How she died lester >> miguel almaguer, thank you. president biden on the global stage today with his first address to the u.n. general assembly the presiden saying we are at an inflection point and calling for unity while facing sharp criticism from key u.s. allies. peter alexander has more >> reporter: facing growing doubts about his promise to unite america's allies, president biden delivering his debut speech to the united nations, calling for global cooperation to combat climate change and covid. >> bombs and bullets can't defend against covid-19 we need a collective act of science and ...

Talking about, "well, i've only seen a body. it's not against the law to see a body." and barr tells him, "hey, shut up. we're all gonna end up in prison." >> and it was somebody with credibility? >> better than what we had before, yeah. >> reporter: but overall, a key problem remained. >> terrible witnesses. >> reporter: meaning detectives spoke with other people who'd also heard the men talk about the murder, but they were not the type a jury would likely believe. like drug and booze soaked gossip. there wasn't enough certainly to support charging peewee. but, thought the prosecutor, maybe h...

Any movement on the republican side in the senate? >> the question is these comments from senator murkowski, which are not surprising because she's always been very independent, it's what kind of influence do they have on other members. it's not just the mitt romneys who don't face re-election, but some who do face difficult re-election, cory gardner, martha mcsally, susan collins, do senator murkowski's comments force them to be somewhat critical or demand any trial process in the senate be fair and complete and thafr row and pass a basic credibility test. that's what we need to be looking ou...

>> reporter: meaning detectives spoke with other people who'd also heard the men talk about the murder, but they were not the type a jury would likely believe. much of what they'd say sounded like drug and booze soaked gossip. there wasn't enough certainly to support charging peewee. but, thought the prosecutor, maybe he could find a way to go after barr and mcmannis. and he had an idea. bring some of the key witnesses before a grand jury just to see who passed the credibility test and who didn't. >> i've prosecuted over 100 homicide cases and the complexity, and the amount of information that...

Hand. >> tell me what happened here. ok, "well, something happened to anna." what happened to her? >> anna's dead. >> what, what? what are you talking about? >> anna's dead. >> when. how -- how -- how is that possible? >> reporter: the cops, who at that point hadn't revealed how she died, noticed that bob, unlike igor, had a strong response. >> his reaction seemed appropriate. >> he was upset? he was emotional? >> yes. >> my first thoughts were for igor. he's like 20 years old at this time. he just lost his mother. and they told me that he knew, he, you know, knew about what had happened. >> r...