here's josh mankiewicz with "a texas twist." >> named for the body of christ, corpus christi sits on the texas gulf coast and just east of the bay is a park known for bird watching, and that's what chris seymour was doing there when she came across something very unnatural. >> to me, it just looked like a pile of debris, to be honest. and then he looked, and he said, oh, my god, it's two bodies. >> a crime so shocking that years later they're still talking about it. >> i can't even imagine what was in that person's mind that evoked his violence, his rage. >> two young women. who wanted them dead? and why? >> it was a true whodunit-type murder. >> and along with who and why was the question of why here? >> this was definitely something that we weren't used to or accustomed to in our town. >> this part of texas isn't exactly ground zero for murder. it's known more for roping, riding, and friday night lights. here life is pretty simple, as are the values its people hold dear, like friendship, family, community. this is where 19-year-old mollie olgin grew up. >> tell me a little bit abou

here's josh mankiewicz with "mystery in orange county." >> orange county, california. on tv, it's a place of sun, fun and privilege. it's where the real housewives first aired their dirty laundry and where the kids from o.c. showed us all what temperature cool really was. around here you get a sense everyone is rich and white and lives in a mansion with a view of the pacific. but step back from the coast and you'll see the orange county that isn't on tv, not as wealthy, not as white, full of those who came here from somewhere else, chasing a better life and finding it in places like santa ana, a mostly working-class immigrant community in the shadow of disneyland. it's the part of the o.c. where people know that to survive, they'll have to work hard. maribel ramos arrived here as a baby, leaving mexico behind. she would not only survive here, but thrive. to tell you the truth, this should be the story of a woman who worked hard to change her life, and in doing so, carved a path for others to follow. >> hello? >> but this story is going to end differently. >> why are yo

here's josh mankiewicz with "deadly exchange." >> reporter: it's a dilemma that confronts every teenager. how to simultaneously fit in with your friends and rebel against everyone else. that two-step is made a little easier by the knowledge, maybe the certainty, that you're going to live forever. >> kids do dumb stuff all the time. >> reporter: and so sneaking out of the house in the dead of night to meet other teenagers to drink, party or just hang out well, that's nothing new. usually teens sneak back home safely. this wasn't one of those times. >> i thought it was some kind of, like, joke. i just couldn't believe it, really. >> i was just freaking out. like, it can't be. it can't be. >> reporter: it was april 2014 when two bright foreign exchange students living in montana, slipped out of their home. >> he's lying face down. he's barely breathing. >> reporter: just minutes later, their amazing american adventure came to a sudden and tragic end. >> where is he bleeding from? >> everywhere. >> it was horrific. >> no one ever knew that someone would die over it, you know? >> it was just

here again is josh mankiewicz. >>> pam fayed was dead.g garage. lapd detective salaam abdul-rahman has seen enough cases to know that, in his line of work, murder and marriage go together like a horse and carriage. the ongoing fayed divorce, therefore, got his attention. >> acrimonious, nasty, bitter. mr. fayed was really upset with his wife, mrs. fayed. >> and so that marriage would bear much more scrutiny. investigators set about talking to friends and family to solve the mystery of pam's death. they needed to start with the story of her life. >> pamela had a spirit that was infectious. >> carol neve was pam's best friend. >> she was always happy. she had a personality that just sucked you in and kept you there. >> carol met pam 22 years ago. >> we were neighbors, and we did become best friends to the tune of every day we talked. every single day. >> that was long before jim came into the picture, of course. >> good morning, baby desiree. first christmas. >> pam was a single mom. she and carol babysat for each other's kids, walked their

here's josh mankiewicz with "the quiet one." sometimes the fresh air of a small town can hide a lot of dirty laundry. >> my worst fear was all of a sudden true. >> sometimes sudden death can lay bare every secret. >> she had felt leak she was abusing it. >> what happened in this small town that would tear apart a marriage and at the same time separate two families that were once united by love. boone, iowa, on flat land just north of des moines is a company town, headquarters for one of the largest grocery stores in the mid-west, fairway, a family-owned company and rick beckwith is a third generation ceo. he and his wife cindy raised a family of five. their youngest daughter emily, a sweet but quiet one. >> the older sister said that she never got spanked. >> she didn't. she just remained silent and would look at me with those big brown eyes and it was over. >> even though emily was from a prominent wealthy family, her friend lisa says emily never flaunted it. >> everyone knew that emily was a beckwith. but i never felt less of