a local teenager named karen mitchell vanished after leaving a woman's shoe store.cold. but that of course as one across the country in new york, another case was suddenly hot again. the investigation into the disappearance of bob's wife kathy. reopened by west chester da janine bureau, who later became a tv host on fox news channel. >> i had an instinct. everything about this wreaked of murder. we had evidence that she was battered by him, which has since confirmed. it was clear to me that he chose her. >> investigation was supposed to be top secret. but as we know, bob durst found out. >> yes, he did. >> then lawrence kathy's friends, you met, her ellen strauss, offered the cops attempt. >> i told the police to interview his best friend [inaudible] i showed them all my research. i knew susan berman was the key. -- >> did plan on interviewing susan berman. the problem was they waited a little too long. >> coming up -- >> my first thought was, what were they waiting, for the dough? >> when dateline continues. with mucinex nightshift, it's not cold and flu season. it

karen tumulty, thank you to both of you. david: thank you. ♪ amna: tonight, pbs will broadcast the ceremony for the prize for popular song awarded disher to joni mitchelld a wheelchair since she suffered a brain aneurysm in 2015, surprised the crowd and took to the stage to sing. ♪ don't cry ♪ amna: right before that show, i talked to another musical legend, annie lennox, as she prepares to honor mitchell. ♪ ♪ sweet dreams are made of these ♪ ♪ who am i to disagree? ♪ amna: annie lennox first thing these lyrics with a debut single released in the early 1980's. a scottish-british pop duo. ♪ some of them want to get used by you ♪ amna: that song was announced just recently has been streamed over one billion times on spotify. annie: i have not been he before today. amna: i met up with linda and asked about the staying power of her music. people covering sweet dreams. a fantastic cover. ♪ what is that like for you to see? annie: it is wonderful. one song can have so many different interpretations. it is almost like happy birthday. do you know what i mean? ♪ amna: her almost five decade career has taken lennox far from her working-class roots in scotland. t