20/20

A mother plunges from a cliff in a fatal fall while hiking on her anniversary. For the first time, her daughter speaks out.  

David Muir reports on "The Code Breakers." After two young women are murdered, their cases go cold for decades until police turn to cutting-edge forensic technology to catch the unlikely killers in both cases.

It's a harrowing tale of horror and homicide near Bozeman, Montana, when an intruder enters the home of three women and shoots two at close range, leaving one dead and the other barely clinging to life. Police quickly make an arrest but then release the person. Who could have committed this heinous crime? 

Matt Baker was a charismatic minister of a small church in Hewitt, Texas, just outside Waco. To his congregation, it looked like he had it all. Married to Kari, a Sunday school teacher, the couple seemed to have a happy and loving marriage and two young daughters, but when Kari was found dead, the carefully crafted facade Matt created soon started to unravel.