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

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.

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

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

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.

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.

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.

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

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

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

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.

A circle of friends from a high school in Miami are about to embark on a new beginning, all heading off to college for the first time. But when one is left behind, he surprises them all with a last minute decision. Dennis Murphy reports.