we fought very hard. >> after a six-day trial, the jury found scott purk guilty of murdering meg, as vidence. >> it was almost unbelievable. after all this time, it finally came through. the truth is out. he's guilty. he's 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 the detective mifflin that night, as they watched his house burn. we do know that if he hadn't, meg's secret would likely have remained buried with her. >> i got into this job to help people, and there's 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. everybody -- they can finally rest in peace that this has been resolved the way it should have been. >> that's all for this edition of "dateline". i'm craig melvin. thank you for watching. i'm andrea canning. and this is dateline! >> two men found what they thought was a mannequin. she had wood piled on top of her. no identification!