A family slaughtered in their home, with only one witness left behind.

Men allegedly scammed by so-called "Military Mistress" speak out.

Nev Schulman, discusses his documentary-thriller "Catfish".

A special edition of "20/20" goes inside the rescue mission in Chile.

A new police chief makes it his personal goal to find a teenager's killer.

Bullying is an epidemic among young people.

Criminals use the plight of the plight of ill children to rip off millions.

The lives of three teenagers addicted to heroin and their struggle with sobriety.

Two people, whose testimony as children sent their father to prison for sexual abuse, find out that they have been manipulated into perjuring themselves; their father, released after 20 years, offers them forgiveness.

Brian Ross investigates practices of Better Business Bureaus around the U.S.

Cher is interviewed by Cynthia McFadden. Also: Ashleigh Banfield reports on a romantic rivalry among teen girls in Pinellas Park, Fla., that led to murder in 2008.

A young girl drowns in her backyard pool, and her young step brother blames his mother after police rule it an accident. However, the mother contends that her son was coached and his inconsistent testimony of the events surrounding the drowning cannot be trusted. She is eventually convicted of first-degree murder by a jury in less than two hours, though she continues to appeal her case.

Seven different people with extraordinary abilities and hobbies are profiled, including a spider-like man who scales buildings, a young singer with talent beyond her years, and a real-life mermaid.

A social pariah turned high school "it" girl is accused of shooting four women with the aid of her criminal boyfriend. She claims the manipulative man is the true culprit, while prosecutors insist she is ultimately responsible.

Look for signs a mentally disturbed person may become a killer; investigation into the Peace Corps; interview with political pundit Ron Reagan, Jr.

Look for signs a mentally disturbed person may become a killer; investigation into the Peace Corps; interview with political pundit Ron Reagan, Jr.

Interview with Capt. Mark Kelly, husband of Rep. Gabrielle Giffords (D-Ariz.).

Authorities continue to investigate the vicious murder of a recently divorced school nurse who was a mother of five; Vervet monkeys raid outdoor bars in the Caribbean.

The murder of a woman on Mother's Day rocks a small town to its core, and the many suspects and total lack of an arrest only adds to the local hysteria. After more than a year and a half, local police continue to investigate, but still offer no answers.Later, monkeys who partake in alcoholic beverages in the Caribbean are profiled.

Teenage homelessness in America is investigated, and Chris Cuomo focuses on telling the harrowing stories of a few select young people who let the cameras follow them through their fight for survival.

A couple and their two young children struggle to survive in their car when they take take a wrong turn down a remote mountain logging road In Oregon. With frostbite, bears, and a diminishing food supply threatening the family's survival, the husband is forced to set out on foot to find help.

Air Force Capt. Colleen Shipman talks about being attacked by astronaut Lisa Nowak; TV personality Dina Lohan talks about her daughter Lindsay's troubles with addiction.

The daughter's of a Utah doctor believe he is responsible for their mother's death.

A wealthy family man is suspected of killing his wife during her recovery from plastic surgery. Two of his own daughters soon take it upon themselves to investigate their mother's death and their father's possible responsibility. They uncover damning evidence, including a hidden affair, missing medications, and a string of false records. However, police are not initially concerned with anything but closing the case.

First, Carmina Salcido (a former American Idol hopeful) helps tell her harrowing story involving her murderous father and his violent, homicidal rampage that left her family and others dead. After nearly being killed as a young child, she was adopted by an ultra-conservative family who kept her in the cultural dark for most of her childhood..Later, people who own crocodiles and alligators as pets are profiled.

A breaking news episode regarding the massive earthquake and subsequent tsunami that devastated Japan.

Two separate murders that may have been partially inspired by the hit television show "Dexter" are investigated. Also, actress and singer Jennifer Hudson is profiled and she opens up about a personal tragedy in her life.

A successful real estate agent is found strangled and burned to death in her own home. Her boyfriend is suspect number one when evidence of arson is found on his clothing, although his defense team argues there is a lack of physical evidence.

Investigative reporting.

Barbara Walters discusses Prince William and Kate Middleton's romance and looks at exclusive home movies, photographs and interviews with their friends; wedding plans.

Part 1

Part 2

The death of Osama bin Laden.

Informercial products are put to the test; interviews with celebrity spokespeople; the Arnold Schwarzenegger and Dominique Strauss-Kahn sex scandals.