heidi was. i am lost for words. it does not make sense. a vibrant young woman stalked by a killer. found dead by her boyfriend. my brother was devastated. the most ominous clue. to the left of where heidi s body was, was a number one. it was not a break in. nothing was broken, did the killer have a key? a decade leader in a state 1500 miles away, detectives finally got their answer and more questions. we knew there was more to the story. did somebody closer to home want her dead? you are 99% sure he had something to do with it but there is no smoke and gun. one more killer still on the run. he knew what he was doing. it does not get worse than that. hello and welcome to dateline. they have been living with her boyfriend for about two years. there were whispers of a wedding but those plans were cut short when stephen arrived home to a scene that was both brutal and bizarre. heidi sprawled on the living room floor. who would want her dead and why? here is
was broken. did the killer have a key? the question always was, how did the person get into the house? a decade later, in a state 1500 miles away, detectives finally found their answer. we got a dna hit. reporter: and more questions. we knew there was more to this story than just some guy coming from colorado to commit a murder and go back home again. reporter: did someone closer to home want her dead? you re 99% sure that he had something to do with it, but there s no smoking gun. so many secrets still to be revealed. i know more about this than i ve said. reporter: and one more killer still on the run. he knew what was in that house. he knew what he was doing. doesn t get any worse than that. reporter: i m lester holt and this is dateline. here s dennis murphy with indiscretion. reporter: she was a bubbly woman in her early 20 s just looking for a clean break. heidi bernadzikowski, a baltimore pool league ace had, in recent years, endured some toug
was broken. did the killer have a key? the question always was, how did the person get into the house? a decade later, in a state 1500 miles away, detectives finally found their answer. we got a dna hit. reporter: and more questions. we knew there was more to this story than just some guy coming from colorado to commit a murder and go back home again. reporter: did someone closer to home want her dead? you re 99% sure that he had something to do with it, but there s no smoking gun. so many secrets still to be revealed. i know more about this than i ve said. reporter: and one more killer still on the run. he knew what was in that house. he knew what he was doing. doesn t get any worse than that. reporter: i m lester holt and this is dateline. here s dennis murphy with indiscretion. reporter: she was a bubbly woman in her early 20 s just looking for a clean break. heidi bernadzikowski, a baltimore pool league ace had, in recent years, endured some toug
12 children. he says, oh, my god. reporter: they didn t have 12, but this devout roman catholic couple did raise their five in a baltimore, maryland suburb. high heidi, the only girl in a sea of brothers. when i hear that, i think poor heidi. yep, yep. reporter: growing up with all those boys. well, and we had friends that used to say to us, oh, she must be treated like a princess. and i said, are you kidding me? she had to be just about tough as they were. and she kept them in their place too, i mean. she wasn t treated like she was a little princess that s for sure. reporter: heidi grew up to be a happy, outgoing, athletic girl, surrounded by friends. it was a noisy, loving family with strict rules. everyone at the table for dinner. mass on sunday and no back talk. heidi s brothers frank and harold. reporter: true that your mom was known to wash out a potty mouth with a bar of soap? i got it. true. reporter: did you? yeah. they were very strict.
when donna and walter bernadzikowski met at a church social, talk of a family even preceded the engagement ring. he used to scare the girls away by saying he wanted 12 children. and i said, well, i always thought i wanted to have 12 children. he says, oh, my god. reporter: they didn t have 12, but this devout roman catholic couple did raise their five in a baltimore, maryland suburb. heidi, the only girl in a sea of brothers. when i hear that, i think poor heidi. yep, yep. reporter: growing up with all those boys. well, and we had friends that used to say to us, oh, she must be treated like a princess. and i said, are you kidding me? she had to be just about tough as they were. and she kept them in their place too, i mean. she wasn t treated like she was a little princess that s for sure. reporter: heidi grew up to be a happy, outgoing, athletic girl, surrounded by friends. it was a noisy, loving family with strict rules. everyone at the table for dinner. ma