here is dennis murphy with "before the storm." >>> the woman captured on security camera moving ghost-like from one room to the next is 37-year-old crystal mcdowell, a real estate agent from baytown, texas. it's thursday, august 25th, 2017. at 7:35 a.m., crystal gets into her black mercedes coupe and backs out of the driveway. on her way to work, but crystal never makes it. texts, phone calls, and emails go unanswered. when crystal's extended family gathers later that evening to watch a pay per view boxing match, cousin jay cherry says they aren't sure if they should be annoyed or concerned. >> it was the night of the mayweather and mcgregor fight. my whole family is here. my brother comes up to me and is like, crystal's missing. but in my head i'm like, what? like, you don't -- you're like, find her. >> that doesn't make sense. >> yeah. he's like, no, she's missing. no one's talked to her since 7:00 in the morning. i'm like, that doesn't mean anything. her phone could be broke, these busy, she works a lot. >> crystal's aunt, a local beautici beautician, was also dismissive when her son ca

here's dennis murphy with "she never left." >>> she'd been gone, unaccounted for for more than 20 years. his mother, bonnie. >> it was odd to be the one that took -- to be the one that found her. >> you'd spent a lot of your life looking for her, right? >> yes, sir. >> there's a poignant video of the mother and child's last christmas morning together, december, 1992. >> yay! >> the boy, aaron, was 3 1/2. >> mom! >> ooh. >> yes! >> look at that later. >> you've seen maybe some home movies and some old pictures. >> yeah. recently i've seen some -- the christmas video. >> you like that? >> yeah. >> okay. >> it didn't trigger any memory. >> no memory goes with that? >> no, sir. >> can't remember so much as a touch or the sound of her voice. >> okay. >> but this story is all about memories. memories lost, memories later testified to. had the child, now a grown man, really seen something as terrible as all that? this is a boy's story like few others. >> mom? >> go back in time to january, 1993, in jacksonville, florida. it's just after the holidays, and there's an argument going on inside tha

here's dennis murphy with "mystery in south beach." >> if you spent any time down here, you probably sense there are really two miami beaches. you know this one by reputation anyway. south beach. a pulsating playground with energy that surges out of the ocean and exhausts itself in the all-night clubs. and then there's the old miami beach. here are the sunburned back streets of apartment blocks, where decades past the old people used to sit out in aluminum chairs. and that's where a young couple, wendy and michel, were trying to make a go of it. the rent was cheap. the window air-conditioning good enough. but if you ever thought beautiful people catch all the breaks, then listen to this story of 21-year-old wendy trapaga because she may be the most gorgeous doomed young woman to ever walk these streets. >> she was model pretty. >> i don't think that she thought of herself as anything spectacular. >> her much older sisters and brother ralph never use the qualifier step sister. they'll tell you she was a little bit of a daddy's girl, international airline pilot who died, sadly, in a cr

here's dennis murphy with "the unusual suspect." >> reporter: consider for a moment the cozy word "home," and all it evokes. warmth. family, shelter. security. got it? and now reflect on what happens when those four walls are breached, when nightmare stuff crawls through the window, kicks in the doors. when a haven becomes a house of horrors. so how does that feel? just ask lloyd irvin. >> i'm laying on the couch. i wake up and there's two gunmen over top of me holding guns, pointing them at me, like, holding down. "you're being robbed. don't move." >> reporter: almost eight years have passed since that night in august 2008, here outside the nation's capital in a nice neighborhood in prince george's county, maryland, but lloyd and vicky irvin and their son, just 4 years old at the time, are still haunted by the image of the gunmen. two masked intruders. >> talk about your worst nightmares. this is it. >> yes, it's something you would never imagine would happen. >> reporter: what the robbers didn't count on was that lloyd is a nationally- renowned martial arts expert. and when one of the