Summary: In the season premiere, the disappearance of two California teenage girls is investigated by Keith Morrison.

Summary: An Easter Sunday celebration in 2006 turns tragic when Wayne and Sharmon Stock are murdered. Correspondent Keith Morrison traces the search for justice in the case.

Summary: The children of an Oklahoma pastor survive the robbery that took their parents' lives and observe the trials of those accused of committing the crime.

Summary: Dateline investigates the murder of model and aspiring Playboy Playmate Paula Sladewski who charred body was discovered in a Miami dumpster.

Summary: Dateline investigates the murder of model and aspiring Playboy Playmate Paula Sladewski who charred body was discovered in a Miami dumpster.

Summary: Dateline investigates the murder of model and aspiring Playboy Playmate Paula Sladewski who charred body was discovered in a Miami dumpster.

Summary: Dateline investigates the murder of model and aspiring Playboy Playmate Paula Sladewski who charred body was discovered in a Miami dumpster.

Summary: Dateline investigates the murder of model and aspiring Playboy Playmate Paula Sladewski who charred body was discovered in a Miami dumpster.

Summary: A popular college freshman is gunned down in her car for no apparent reason. Police had no clues: no fingerprints, no information about trouble in Michelle O'Keefe's life. Then an unexpected source comes into the picture.

Summary: Chris Hansen files a report on Mexico's drug war. Hansen joins with Mexican federal officers on a secret assignment to capture kingpins and relates the story of a hit man leading a double life. Also - a woman who sacrificed all to battle corruption.

Summary: A teenager and her family stop a string of attacks against women when they stop a killer in his tracks.

Summary: Lester Holt reports on youth violence in Chicago and the efforts being made to combat gangs and get guns off the streets.

Summary: When a college student commits suicide, her friends and family question the identity of a person she met in a suicide chat room; a man is accused of murdering a former friend.

Summary: A husband is found dead in a stable in what appears to be a horse accident. But when bullet casings and a bloody pipe are found nearby, blame shifts to his wife, whose daughter and son accuse her of plotting the murder and convincing her son to commit the crime.

Summary: When a college student commits suicide, her friends and family question the identity of a person she met in a suicide chat room; a man is accused of murdering a former friend.

Summary: When a college student commits suicide, her friends and family question the identity of a person she met in a suicide chat room; a man is accused of murdering a former friend.

Summary: When a college student commits suicide, her friends and family question the identity of a person she met in a suicide chat room; a man is accused of murdering a former friend.

Summary: When a college student commits suicide, her friends and family question the identity of a person she met in a suicide chat room; a man is accused of murdering a former friend.

Summary: When a college student commits suicide, her friends and family question the identity of a person she met in a suicide chat room; a man is accused of murdering a former friend.

Summary: Footage and interviews from coverage in the days following Hurricane Katrina; Brian Williams describes the chaos he witnessed while reporting from New Orleans.

Summary: They were beautiful and passionate about each other. Paul Zumot and Jennifer Schipsi seemed to have it all. Dateline NBC’s Keith Morrison tells the story of a burning passion that turned into something deadly.

Summary: Chris Hansen goes face-to-face with a man, who along with other conspirators, cheated a Connecticut woman out of her life savings through an internet scam.

Summary: 24-year-old Elisa Levy thinks she's headed to a meeting about an environmental project. But the "meeting" is really a setup for abduction. NBC’s Kate Snow reports.

Summary: A former homecoming queen comes under suspicion after her husband is found stabbed to death and an affair with the local youth pastor is uncovered.

Summary: Clerks steal winning lottery numbers from unsuspecting customers and claim the prizes.

Summary: Murder suspect Joran Van der Sloot speaks out for the first time since his arrest.

Summary: Tom Brokaw reports the story of three different families throughout the war in Iraq.

Summary: With no arrest having been made years after a real estate agent's murder, frustration continues to mount among her family and friends; detectives connect a series of seemingly random crimes to crack the case of a missing young man.

Summary: The murder of a husband exposes the shocking secret life he had with his wife. They were swingers.

Summary: Lester Holt reports the story of three American women who face the Great Recession and their own worst fears.

Summary: A young father fights desperately across the United States for custody of his baby girl. Plus the story of Nancy Cooper who went missing while jogging in a suburb of Raleigh, North Carolina.

Summary: Watch amazing animals and the true stories behind some of the most popular videos on the web.

Summary: A serial killer stalks human prey through America's national forests until clues help trigger a multi-state manhunt. Dennis Murphy reports.

Summary: Former Vice President Dick Cheney discusses his new memoir with Jamie Gangel; Grammy award winner Miranda Lambert is interviewed by Hoda Kotb; 12-year-old author of "Heaven is for Real" sits down with Hoda Kotb to hear about his trip to heaven.

Summary: Tom Brokaw, recaps some of the most powerful stories reported by NBC News in the days and months following the tragic assault on our nation.

Summary: An indie film-maker is connected to the case of a missing man, which started as an obsession with "Dexter". Was it a publicity stunt or something far darker? Keith Morrison reports.

Summary: An intensive weeklong group-therapy session allows people to start over. Keith Morrison reports.