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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 som ....
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 som ....
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 st ....
host: dr. neil degrasse tyson did your new book astrophysics for people in a hurry you open by saying the universe is under no obligation to make sense what does that mean?. i think up until the year 1600 when we had no particular tools to investigate the natural world the five senses were the primary means we gave all information about the universe and not even knowing that our five senses had live and said everything you know, the thinking of letting tries to give you but it is not better run at 1500 it would go one direction than the telescope it was a decade within one another now it becomes available to us to transcend our senses to look inside a drop of pond water to see microorganisms doing the backstroke that the sensory system could not have detected with not for the microscope so the welcome to the universe tire living creatures living in a drop of water but today we know that from childhood but that made no sense at all without royal society in london ....
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 dinn ....