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thank you for watching. >> i'm craig melvin. >> and i'm natalie morales. >> and this is dateline! >> he said he couldn't handle talking about it. i was angry at him. if you're not going to tell me what happened, then you're going to dance around the issue and tell three different stories, what are you hiding? >> it started as a teen romance. >> two of my girlfriends are like, there's this guy, and you need to meet him. >> i was in love, yes. >> it ended in one of the strangest love stories you'll ever hear. >> i felt like i got hit by a bus. >> right before their wedding, her mother ...

bus. >> right before their wedding, her mother and his father got married. >> they told us, we ran off, we eloped. who does that? >> two families and a small town left stunned. but it was nothing compared to what happened next. >> he looks like he's been shot. he said someone broke in last night. >> a deadly attack in the dark of night. her mother murdered. >> i realized that last conversation i had with her, that was it. >> his father bruised and bewildered. >> i don't remember anything else, other than waking up in the morning. >> was it a robbery? >> the television's on. >> was it...

After a sudden marriage creates tension between two families, a murder exposes secrets, lies and a long-buried mystery.

Mother he couldn't even handle. just -- it wrecked him. >> and when aaron heard pam was dead -- >> my first response was, how did he do it. >> and then he told the cops about his mother. now, you may have a serial killer on your hands. serial killer of spouses. >> something like that. >> that was the thought. >> two wives, one missing, the other dead. and the one thing they had in common was ralph candelario. but suspicion alone wasn't enough. it wasn't proof. so the investigation continued? >> yes. >> in an effort to shake him, or maybe even get a confession, they sought help from the one per...

About his mother. now, you may have a serial killer on your hands. serial killer of spouses. >> something like that. >> that was the thought. >> two wives, one missing, the other dead. and the one thing they had in common was ralph candelario. but suspicion alone wasn't enough. it wasn't proof. so the investigation continued? >> yes. >> in an effort to shake him, or maybe even get a confession, they sought help from the one person whose presence back at the hospital made ralph break down and cry. shannon. >> cbi had me call him, bugged my phone and tried to get him to tell me what happened. >>...