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>> i'm gonna leave the house and the phone rings. you could see the area where heidi was. i was lost for words just doesn't make sense. >> a vibrant young woman stalked by killer. >> i cringe every time i think about it >> found dead by her boyfriend >> my brother was just a mess. he was devastated. >> the most ominous clue, >> u on the wall to the left of you heidi's body was, was a number one. she's number one and get ready because here comes trouble >> exactly >> it was not a break-in the windows, the door, nothing was broken did the killer have a? keith >> the question always was...

>> i'm craig melvin. >> and i'm natalie morales >> and this is dateline. ♪ ♪ ♪ >> he was definitely charismatic. >> he was the new kid in town, super popular, all about adventure. >> this kid was like, awesome. >> he jumped right in th culture. >> he liked to show off to the girls. >> they were the neighbors just down the block, of family in fear. >> they had their vehicles broken into, she was scared. >> someone had been sneaking into their home and now someon was in their garage. >> i'm sitting there panicking he's coming after me >> in a flash, it was over >> that charismati...