Route 91 Harvest Festival underway in Las Vegas, filling open air plaza on The Strip with country music lovers as shooter prepares in hotel; Woman describes moment when husband was shot while holding her; Remembering the Las Vegas mass shooting victims.

Brother recalls the 2011 day he saw his sister, Holly, alive for the last time; Missing 20-year-old Tennessee nursing student Holly Bobo's remains are found by ginseng hunters; Jury returns with verdict in man's trial for Holly's murder.

When Stacey Castor's second husband dies suddenly, investigators learn her first husband is also dead. Castor is suspected of murdering her second husband and poisoning her own daughter.

Successful Houston veterinarian finds love again with younger doctor; Authorities set up an elaborate sting operation to catch a him after he convinces her they need to hire a hit man to kill their exes; Man speaks to 20/20 while he awaits trial behind bars.

Tito Jackson's ex-wife Dee Dee Jackson tragically drowns; Jackson family finds death of Tito Jackson's ex-wife suspicious; Dee Dee Jackson's sons won't object to mom's convicted killer being paroled.

Parents spying on their children; Carnie Wilson talks about her surgery and career; Jane Pauley discusses her retirement from NBC and future endeavors; a teenage girl born without arms excels

Understanding Transgender Children

Get ready for a big dose of shocking disclosures… from doctors and hairdressers and even burglars, the people in your neighborhood reveal some surprising secrets of their trade.

Neighbors terrorized by a bully in a bulldozer; a tiff over trees that became a deadly turf war; a high-tech neighborhood watch system… “20/20″ pulls the blinds back on the nastiest neighbors around.

The ultimate cases of betrayal.

Jailhouse interview with the high school cheerleader who engaged in a same-sex underage relationship that made national headlines

Diane Sawyer sits down with Malala Tousafzai, the 15-year-old Pakistani girl that made headlines by surviving being shot in the head for simply wanting to go to school and she is sharing her story of determination to keep learning.

Kelly Osborn has spent nearly five years trying to piece together the details of how her daughter, Sheena Morris, could have been found dead in her hotel room on New Year's Day.

What Caused Greg Fleniken's Mysterious Death in a Texas Hotel Room?

Paul Fronczak, an almost 50-year-old married father and businessman that was known for decades as a kidnapping victim, but after using Ancestry.com and following a genetic history, he may have found his family.

Former Rutgers University men's basketball coach Mike Rice said he has learned from his mistakes and is now a changed man.

Deborah Roberts discusses how to avoid being a victim with a convicted car thief; Amy Robach talks to bartenders about what goes on behind the bar; a former vet confesses to Gio Benitez about tricks the industry pulls; Jim Avila interviews truckers.

Barbara Walters sits down with President Barack Obama and the First Lady Michelle Obama in their first joint interview of the year and viewers are shown clips from some of Barbara's past interviews with previous presidents that were memorable.

Nelson Mandela Tribute

In their first interview, Hayden and Abby Catt said their father recruited them to rob banks.

Mall security guard tasers mom and more.

Cecilia Vega reports on a plastic surgeon that advocates a controversial diet that sews a patch to a patients tongue so that they can only consume liquids; Robin Roberts talks with the woman that stopped looking into mirrors for a year.

Kenny Tarr is accused of hoaxing several pro-coaches, and could face jail time.