after the mysterious death of his wife, katherine, paul novak was trying to move on. new girlfriend. it then came that knock on the door, and detectives placed paul under arrest. soon, he would learn that someone was claiming they had disturbing new details about the night of the fire. paul's world was about to turn upside down. once again, here's andrea canning with secrets and lies. >> after novak's death has been a cold case for more than three years when, out of nowhere, a witness came forward, pointing a finger at katherine's estranged husband, paul . so who was this mystery witness? a woman from paul's past -- his ex-girlfriend, michelle. >> michelle lafrance, who was the defendant alibi in 2008, has now come forward and said paul was not home, and that paul killed katherine . >> what was that phone call like? >> it was now time to get to work. >> jim ferrell was now the district attorney and teamed up with a former d.a.. >> didn't feel good that you had a break? >> it's a break, but again, i needed more information. >> investigator sat lafrance down to hear her

paul, and here he is, serving you up the sport. and let's begin with wimbledon, shall we? >> novak djokovic? oh, dear.t holger rune yesterday in three sets, and holger rune, loved. you said he's loved, isn't he ? you said he's loved, isn't he? >> he's very popular. >> he's very popular. >> everybody loves aruna. and the thing is, he was beaten. but the thing is, he was beaten. but the crowds were cheering for rune , and. but it sounds like a rune, and. but it sounds like a boo. so, quite frankly, you get the rune. so that's what the crowd was shouting. yeah. and novak djokovic took it the wrong way . he assumed that they were way. he assumed that they were actually booing him when they were actually calling. i mean, they do. bruce springsteen concerts. people who've never been to see see the boss before. there's bruce. it's like, what were you booing for? >> but djokovic says he knows all the tricks and he still thinks that despite your apology and explanation for that, they were booing him. >> they were well, he said, i know they were cheering for una, but that's an expert. >> that's an excuse to boo

paul and katherine's families. >> we will work to give those kids what katherine wanted for them. >> up in narrowsburg, where katherine novak's beloved red house once stood, the trees glow orange and gold. autumns have come and gone. her mother still mourns the daughter she lost, but remembers the life she lived. >> what you miss most about her? >> her smile, and her hugs. she was a lot of fun, katherine. she enjoyed life a lot. >> that's all for this edition of dateline. i am craig melvin. thank you for watching. >>> hello, i am craig melvin, and this is dateline. >> in the pit of my stomach, i knew something wasn't right here. >> he must have been so, so scared. >> they were so happy at first. >> kevin just fell in love with her. >> but when the marriage went bad, he went missing. >> he just disappeared. >> was this a husband who didn't want to be found? or was this a wife who had something to hide? what had happened behind closed doors? >> she laughed and said, no, there is no affair. >> someone was keeping secrets, and even police couldn't wrap their heads around this one until they found a trail of text. >> we were like,

paul in the round of eight, which gives the u.s. two men in the wimbledon quarters for the first time in almost 25 years. that is indeed impressive. meanwhile seven time champion novak djokovic breezed by in straight sets and admonished the crowd over perceived boos during the fourth round match. >> to all those people that have chosen to disrespect the player, in this case me, have a good night. >> i'm hoping that they were just commenting on ruin and they weren't disrespecting you. >> they were. they were. i don't accept it. no, no, no. i know they were cheering for ruin, but if that's an excuse to also boo -- listen, i've been on the tour for more than 20 years, so trust me i know all the tricks. i know how all it works. it's fine, it's fine, it's okay. >> can't tell if he's being sarcastic there. ruin's supporters often stretch out his name when cheering for him which can sound a lot like booing. i get where he's coming at, okay. there are now two contenders for the home run derby. they'll compete in next week's slugging contest. the two all-stars join three other confirmed derby contestants with more participants expected to be announced in the coming days. >>>

paul. so that leaves wimbledon? yes. >> what do we think, carlos alcaraz managed to beat novak djokovic yesterday . fantastic.m the tiebreak. very easily, didn't he? i mean, he really did just walk over him when it got to. i don't know whether you felt this, but when it got to that serving out and it got to that serving out and it looked like he was going to finish it very easily, it looked like he got a little bit wobbly, didn't he? alcaraz didn't you think that eamonn didn't? yeah. when he served serve, he couldn't serve a championship point. and it was at that moment that's when you think there's real true champions. >> i would get this over that net. he just kept hitting the net. >> but i found that that was the thing with djokovic though. i've never seen him hit forehand into the net as much as he did. i mean, it is remarkable the fact that he did get as far as he did, you know, with the knee injury and the and the operation. but i mean, he is, in my opinion, the greatest tennis player that's ever played. i am going to say that watchdog which? whether i like him, i'm federer, i love federer, he was my fa