. >> it's a story keith morrison followed for nearly ten years. >> i get a call from her boss said she hadn't showed up for work. >> they found her in the car. >> i saw in the back, ligature marks. >> didn't deserve that. >> a small island. small pool of suspects. i had no idea he was a drug dealer. >> the soon to be ex-husband. >> that morning he called in sick. >> was there a polygraph. >> and the lover? >> he didn't do that good either. >> without much to go on, this case was growing colder by the day. >> nothing, just nothing happened. >> but a father doesn't forget. >> i have to have justice for my daughter. >> after all these years, are there still secrets to uncover? >> quite a journey for you. >> it isn't over yet. >> this father finally got his answer. but is it the one he wanted? >> every in my wildest dreams would i imagine what we're going through now. : >>> held. sandra galas was born and raised on an island known as one of the most beautiful places on earth. how could something so ugly happen there? the young mother found strangled to death in her garage. police immediate

here's keith morrison with "manson." >> april 14th, 2016. a clear, blustery day in the high desert outside los angeles. inside the walls of the california institution for women, a gray-haired 66-year-old inmate appears before the parole board, as she has done many times before. but this time something remarkable. >> a parole board panel is recommending the release of former charles manson follower leslie van houten. >> leslie van houten, a name on the list forever linked with one of the most famous crimes and criminals of the 20th century, charles manson. >> you don't understand me. that's your trouble, not my fault because you don't understand me. i don't understand you either! >> the story of charles manson, his family and all the horror they wrought is buried in archives, memorialized in media long obsolete, and yet somehow it feels present. that hot summer night that caught the world utterly unprepared, when los angeles became suddenly a very scary place. it was august 9th, 1969, around 8:00 a.m. officer jerry derosa was a young cop with

here is keith morrison with "the threat." >>> tucked away in the corner of this cemetery is the final resting place of a woman called joan, barbara joan lockwood. she wasn't a famous woman, joan, wasn't rich or celebrated. she lived a quiet life in a quiet place and was buried here more than three decades ago. but oh, if ghosts could rise from their graves, if joan could speech to us now, what questions could she answer? what vision for this man, this tough, aggressive prosecutor who now fears for his life? >> this man is a threat to me. he's a threat more importantly to my family. >> some cases refuse to lie down and die. >> here we are now. >> joe lived when she lived a thousand miles south of that cemetery a few miles from the beach in l.a. in a suburb called torrence on a quiet street named sharon lane. tlgs there was joan, her husband, and their four children. >> people would describe her as the most caring person they ever met. >> my mom left her kids. we were first and foremost her -- what was important to her. >> the whole neighborhood knew that. >> the neighbors loved my mom

here's keith morrison. with deadly trust. >> reporter: there's a place, call it a pot of gold at the end of ambition, of the american dream. a place the few and lucky build their mansions by the sea. newport beach, orange county, california, where the most unexpected event would be murder. >> things like this rarely happen in newport beach, let alone in an area as secure as this area. >> reporter: let alone involving people like this, attractive, charismatic, living large. like nanette johnston packard mcneal. >> she had a beautiful home, drove an expensive car. and she was sort of living that dream california lifestyle. you talk about "housewives of orange county," she could have been on the show. >> reporter: yes, in fact, she told friends she turned down an offer to be on that show. about excess in orange county. she ended up on a show called "american thunder" about motorcycles, showing off her own excess, including a bike she bought for 50 grand. >> what's your favorite part of the bike? >> i love the

here's keith morrison with good and evil. >> how do you measure a mother's love? or gauge the ferocity of her impulse to protect. >> to love her as much as i could was about the only thing. >> how to measure love as visceral as the beating heart in her own body. >> she was my first-born. she was my best friend. >> how to understand the four mothers you'll meet tonight and their connection. one that not one of them would ever have thought possible. not in a million years. any more than they would have expected to meet her. their guardian angel. >> if i don't bring her home, who will? >> reporter: its a rare mystery that's truly a confrontation of good and evil. >> we have to go to the dark places in order to find answers. >> reporter: a rare mystery that needed an urgent answer, before the evil struck again. it was march 14th, 2014, early morning. an army of garbage trucks made their growling, clanking way around the thousands of trash bins and dumpsters in anaheim, california. their destination, a landfill that is also a literal mountain of garbage 500 feet high.