we fought very hard. >> after a six-day trial, the jury found scott purk guilty of murdering meg, as le after all this time, it finally came through, you know. the truth is out. he is guilty, he is going away. >> the judge gave scott purk 15 years to life on top of his arson sentence. we may never know why scott purk murdered meg or why he mentioned her to detective ken mifflin that night as they watched his house burn. we do know that if he had not, meg's secret would likely have remained buried with her. >> i got into this job to help people, and there is nothing better than making a family happy with an outcome for a case, and in this case, it's beyond happy. it's beyond words. they can finally rest in peace that this has been resolved the way it should've been. >> that is all for this edition of >>> i'm andrea canning and this is "dateline". >> two guys saw what they thought was a mannequin. she had woodpiled on top of her. no identification. >> we all came together by becoming volunteers to identify jane does and john does. >>

purk murdered meg or why he mentioned her to detective ken mifflin that night as they watched his house burn. we do know that if he had not, meg's secret would likely have remained buried with her. >> i got into this job to help people, and there is nothing better than making a family happy with an outcome for a case, and in this case, it's beyond happy. it's beyond words. they can finally rest in peace that this has been resolved the way it should've been. >> that is all for this edition of >>> i'm andrea canning and this is "dateline". >> two guys saw what they thought was a mannequin. she had woodpiled on top of her. no identification. >> we all came together by becoming volunteers to identify jane does and john does. >> there's a passion trying to fig out who our doe is. what if this is your family. you want to give them closure >> to us homicide detectives, it's way above our heads. >> i said, i think i know how we can do it. >> all of these people share some amount of dna with our unknown person. >> we thought, this is the family. this is it. >> surreal. it felt like somebody had