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how is that possible? >> a young mother found brutally murdered. her little girl left to wonder in her mothers blood. police had a suspect and they say that he had a motive. >> we had an intimate relationship. >> ended up having sex. >> could they prove he was the killer? >> it was a circumstantial case, except for that witness, the girl who left those footprints. >> they will never know what cassidy saw and what she did not see. >> maybe she could not tell detectives who the killer wa...

brutally murdered. her little girl left to wonder in her mothers blood. police had a suspect and they say that he had a motive. >> we had an intimate relationship. >> ended up having sex. >> could they prove he was the killer? >> it was a circumstantial case, except for that witness, the girl who left those footprints. >> they will never know what cassidy saw and what she did not see. >> maybe she could not tell detectives who the killer was, but maybe she did not have to. >> the fact ...

cassidy saw and what she did not see. >> maybe she could not tell detectives who the killer was, but maybe she did not have to. >> the fact that cassidy was spared, would that mean anything to a jury? >> person who killed the mother cared about cassidy. >> hello and welcome to dateline. michelle young was married to her college sweetheart, four months pregnant with their second child when the unthinkable happened. the young mother was beaten to death in her own bedroom. investigation w...

Brutally murdered. Her little girl left to wonder in her mothers blood. Police had a suspect and they say that he had a motive. We had an intimate relationship. Ended up having sex. Could they prove he was the killer . It was a circumstantial case, except for that witness, girl who left those footprints. They will never know what cassidy saw and what she did not see. Maybe she could not tell detectives who the killer was, but maybe she did not have to. The fact that cassidy was spared, would tha...

My mother called and said michelle is dead. How is that possible . Reporter a young mother found brutally murdered. Her little girl left to wander in her mothers blood. Police had a suspect and they say he had a motive. But could they prove he was the killer . It was a circle case. Reporter except for that witness. The girl who left those footprints. We will never know what cassidy saw and what she didnt see. Maybe she couldnt tell detectives who the killer was, but maybe, she didnt have to. The...

>> yes. was one of the side exits of the hotel. the fire stairs that go down to the first floor. >> was there any other tampering done? >> the door that was adjacent to where this camera was located, that door had also been propped open at night. >> how do you know that? >> the gentleman working as the clerk that i found a rock that had been placed in the door to keep the door from closing. then they plugged the camera back, and so its now working again. at about 6:35 that morning, suddenly that...

Along with another nugget. >> he wrote, "our marriage has seen better days and i dont see it trending up." i remember that really striking a chord with me. because i didnt know that their marriage had seen better days. >> reporter: so of course investigators wanted to interview jason young. maybe he could tell them something. but he refused to talk to them. >> he talked to the lawyer. and then under the advice of counsel he declined to speak with us at all. >> reporter: didnt ask about it? didnt...

>> reporter: the very questions that wake county investigators were asking themselves. >> as the investigation gets under way, a security camera provides a critical clue. its not what it caught. its what it missed and why. >> coming up -- >> there was a camera there that had been unplugged. >> really? >> yes. it was one of the side exits of the hotel. >> who had something to hide? when "silent witness" continues. . did any of you hear the "bundle your home and auto" part? -i like that, just not ...

And said so in an e-mail. along with another nugget. >> he wrote, "our marriage has seen better days and i dont see it trending up." i remember that really striking a chord with me. because i didnt know that their marriage had seen better days. >> reporter: so of course investigators wanted to interview jason young. maybe he could tell them something. but he refused to talk to them. >> he talked to the lawyer. and then under the advice of counsel he declined to speak with us at all. >> reporter:...

>> reporter: the very questions that wake county investigators were asking themselves. >> as the investigation gets under way, a security camera provides a critical clue. its not what it caught. its what it missed and why. >> coming up -- >> there was a camera there that had been unplugged. >> really? >> yes. it was one of the side exits of best friends. advantage ii, kills fleas through contact all month long. i mean hes a wreck without me. advantage ii, fight the misery of biting fleas. oh, co...