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Nobody knows where the bullet comes from. Nothings making it any easier. If you dont have a motive, its hard to know which direction to go. We were just never going to know. But someone knew. She called me and she said, i think i know something about a murder. We never could find out why trent was killed because it was something this weird. She became the key. Would she also become the next victim . She was scared to death to confront him. Let me ask you a question, youre not setting me up, are you . She knew what he was capable of. And thus she was terrified. And thus she was terrified. Hello...

>> i was, like, "it's who? " that can't happen. why him? >> no one saw a thing. >> it's at night, it's dark, nobody knows where the bullet comes from. >> nothing's making it any easier. >> if you don't have a motive, it's hard to know which direction to go. >> we were just never going to know. >> but someone knew. >> she called me and she said, "i think i know something about a murder. " >> we never could find out why trent was killed because it was something this weird. >> she became the key. >> would she also become the next victim? >> she was scared to death to confront him. >> le...

it's hard to know which direction to go. >> we were just never going to know. >> but someone knew. >> she called me and she said, "i think i know something about a murder. " >> we never could find out why trent was killed because it was something this weird. >> she became the key. >> would she also become the next victim? >> she was scared to death to confront him. >> let me ask you a question, you're not setting me up, are you? >> she knew what he was capable of. >> and thus she was terrified. >> and thus she was terrified. >> hello and welcome to "dateline. " trent digiuro was a fo...

And just ask that it be kept under wraps until we can get him secured. i mean, we negotiated that. it was like, listen, don't get me involved in this. i want to do this for the family. this guy's dangerous. so until you get handcuffs on him, you can't involve me." >> reporter: but evans knew, even if he did arrest the guy, a mystery woman testifying about something an ex-boyfriend told her wouldn't be enough. >> i can imagine a prosecutor saying, well, i can't just put her on the stand, his attorney will come along and say, "she's full of it." >> yeah, and in this particular case it's, yeah. y...

Don't get me involved. i want to do this for the family. this guy is dangerous. but until you get handcuffs on him, you can't involve me. >> evans knew even if he arrested the guy, a mystery woman testifying about something an ex-boyfriend told her, it wouldn't be enough. >> i can imagine the prosecutor saying, i can't just put her on the stand. his attorney will come along and say, "she's full of it." >> yeah, and in this particular case it's, yeah. you know what? that in itself is not gonna do it, nor should it. we're still in a situation where this has to come from him. >> him, meaning shan...