The stories of men and women from around the country who have dramatically transformed their lives by adopting new, healthier lifestyles and losing up to half of their body weight, and the impact it has had on their loved ones.

From tricks of the trade for saving money on nuptials, and "Groomzillas" to extreme wedding proposals and wedding mishaps, "20/20" provides viewers with a behind-the-scenes look at the cutthroat wedding industry.

Understanding Transgender Children

Manti Te’o hoax, Beyonce Lip-Sync Scandal, an a real-life Norman Bates who impersonated his dead mother to keep her New York home.

Born into the spotlight for better or worse, “20/20″ reports on the kids of celebrities.

Nathan Carman Describes Seeing Mom For the Last Time at Sea; Police Question Nathan Carman in Grandfather John Chakalos' Murder; Insurance Company Won't Pay Nathan Carman's Claim For Boat Lost at Sea

Reports on the crippled Carnival cruise ship Triumph and the eight-day trip to misery that ensued for the more than 4,000 passengers on board.

GMA co-anchor Robin Roberts shares her personal story and comeback to the anchor chair five months to the day she underwent a bone marrow transplant to treat myelodysplastic syndrome or MDS, a rare blood disorder.

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A story of how using a GPS system can backfire and send you down the wrong paths; a report on the 2012 Thanksgiving 140-car pile up that claimed two; an investigation into the accuracy of CARFAX; Russian dash cams.

A case involving two high school football players that were found delinquent by a Juvenile Court for the sexual assault of a 16 year old girl; exclusive interview with defendant Ma'lik Richmond.

From psycho exes to your Facebook 'friends'.

A man that was used to taking advantage of women online met his match; a motorcyclist claims a former female IRS agent made a deal to make his tax problems go away for intimate contact; 20/20 looks into disability con artists.

Latest information regarding the Boston Marathon tragedy; reports on the importance of split-second decisions.

An unidentified man claims he survived a carjacking done by the Boston Marathon bombers, April 23, 2013.

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.

Amanda Knox discussing her life before, during and after the trial that made her international headlines; three stories that talk about serious neighborhood problems.

When a woman tries to divorce her husband, TV producer Richard Shenkman, he reacts with a violent rampage that includes stalking, burning a house to the ground, and kidnapping his estranged wife at gunpoint.

Barbara Walters gives viewers a thorough look at the role of the new royal heir and how they will be raised; a look at the years Barabara has covered the royal family; Amy Robach reports on what it takes to be a nanny for the royal family.

A 5-year-old boy named Ethan had been snatched off a school bus and was being held hostage by a homicidal kidnapper in an underground bunker wired with explosives. If police did not meet the kidnapper's demands, he could detonate the bombs, killing himself and little Ethan.

20/20 goes into the world of servants and assistants of the rich and famous; Nick Watt reports on the relationships between servant and employer; Amy Robach listens to outrageous stories from employees of the famous; David Muir learns what it takes.

Unusual and sometimes controversial parents who are raising eyebrows. Mom abandons kids, rapper puts child in crude videos, mom keeps getting breast enlargements despite daughters woes, and teenage daughter emancipates herself from parents.

Stories of people losing their cool in several scenarios ranging from road rage, upset athletes, disorder in the courtroom to a doctor that continually fights allegations of violence directed toward women.

A group of alleged criminal teenagers wanting their own brand of fame and the fortune that comes with it and their leader sits down with ABC News to talk on their methods; a small town dealer becomes an unknowing drug trafficker.

Man Who Killed Neighbor Over Loud Party Says It Wasn't Murder.

FLDS Escapee's build a life outside Warren Jeff's control.

Updates - Dunwoody Day Care trial in which a woman's husband was murdered in Atlanta by her boss and evidence points toward an affair that has led to his conviction and she is charged with murder.

A woman was fired for being too attractive to work for a dentist, Paula Faris reports on what she did afterward; Cecila Vega looks into a cosmetic surgeon from Long Beach sewing patches into patients tongues to keep them from eating solid foods.

Nick Watt travels with a paparazzo to see how they track and photograph celebrities, including young actors; Dan Abrams interviews Usher's ex-wife Tameka Raymond about her struggle for full custody of her son; Chris Connelly reports on kid tweeting.

The LAPD's Hit and Run Investigation Unit and how they track down offenders; surviving road hazards; the story of a GPS that got three women lost.

David Muir sits down with Jeffrey Marsalis, a man accused of date rape on dozens of counts from using an online profile on Match.com to attract women; he's been acquitted of the charges twice, but a new case may reveal crucial information.

A chiropractor that has gone through six marriages and been convicted of arson is also reportedly under investigation by the Alabama Attorney General concerning the death of his sixth wife, given a record of incidents in his marriages.

Small Town Sex Scandal Embroils Ex-Mayor.

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.