You Might Be Rich continues this Sunday at 7 p.m. ET, 6 p.m. CT! Donald Trump joins NBC News' Tiki Barber to surprise one unsuspecting family with the incredible news they have unclaimed money coming to them in a special broadcast of "You Might Be Rich" live from Rockefeller Center in New York City.

And from 8-9 p.m. ET/7-8 p.m. CT, NBC's Chris Hansen joins the Security Enforcement Division of the California Lottery on a unique undercover investigation to test the compliance of the state's lottery retailers.

It's the kind of place where the great unknown in most teenagers' lives might seem to be what college they'll attend. But now a wealthy beach community is trying to understand a much bigger unknown: What led some of America's most privileged young people to turn on one of their own - a local surfer about to hit the bigtime? It started as just a group of youths out for a night of fun. So how did a fight over a spilled drink end with one of them dead? A wake up call for parents everywhere.

Keith Morrison has the story of The Surfer and the Bird Rock Bandits, Friday on Dateline at 9 p.m. ET, 8 p.m. CT.

In state treasuries across America, billions of dollars in unclaimed property sits, waiting to be returned to millions of people.  Yet many state officials don't have the resources to find everyone. Last August, Dateline NBC helped states crack some of their toughest, unsolved cases with the result of nearly $2 million being returned to average Americans.  Now NBC News' Tiki Barber and his team, including NBC News' Peter Alexander and MSNBC's Tamron Hall, are back at again, finding ordinary people who are unaware they have money coming to them in "You Might Be Rich!"

Barber and his team travel from coast to coast and overseas to help return close to $5 million to over a dozen individuals. Especially timely considering today's economy, Dateline was able to bring great news to some individuals in financial trouble.  In one case, the NBC News team traveled to Germany to give a former Pennsylvania resident the news he was entitled to over a half million dollars from an inheritance.  The story becomes even more extraordinary when our team discovered the recipient was homeless. In another case, Dateline spent a year tracking down the rightful owner of more than a million dollars that was sitting in the Illinois state treasury waiting to be claimed.  The two, hour-long specials are airing on Sunday, April 26 at 7:00 p.m. ET, and Sunday, May 3 at 7:00 p.m. ET.

For the May 3 program, "You Might Be Rich!" will be live from outside Rockefeller Center. Donald Trump will join Tiki to surprise one unsuspecting family with the incredible news they have unclaimed money coming to them.

Our story centers on a well-known defense attorney who lived a comfortable life in a chic suburb with his wife and children. Then one night, with two bullets, it all came apart: He was shot... and his wife of almost 30 years was killed. Who could have been behind it? Perhaps an angry former client out for revenge? Investigators would have to re-enact the crime to solve the mystery and uncover what really happened on "A Long Dark Stretch of Road."

See this intricate look inside a crime - and what it does to a family - Friday night at 9 p.m. ET, 8 p.m. CT.

In a special two-hour Dateline, correspondent Dennis Murphy reports on the mysterious disappearance of a young woman in a Detroit suburb. Cindy Zarzycki was only 13 years old when she was last seen at a Dairy Queen in her hometown of Eastpointe, Mich. in the spring of 1986.

For eight years following Cindy's disappearance, her case was treated as a runaway. That is, until Detective Derek McLaughlin was promoted to the Eastpointe's Youth Bureau detective division and took over the case. With the help of a college intern, Jen Leibow, as an investigator, this dedicated team worked tirelessly for years to solve Cindy's case and bring her family closure. Watch it Friday at 9 p.m. ET, 8 p.m. CT.

NBC's Hoda Kotb has the story of a 13-year-old boy named Sam who is funny and smart and kind of a goofball. So when he starting limping and falling down for no apparent reason, his parents thought he might just be fooling around. They were wrong. His body had begun to change in terrible ways his family couldn't understand. His doctor came up with a risky plan that just might save him, but Sam would have to agree to it. It would be a terrifying decision. But if his body was betraying him, maybe his courage would see him through.

Also: For many girls, it's the ultimate fantasy: to be discovered, and make it big as a model or actress. And, wouldn't you know, there are people standing by to help make that dream come true, offering everything from classes to meetings with casting agents. And lots of loving parents are willing to pay thousands to help their daughters reach for the stars.... But do they always get their money's worth? What we found out isn't pretty. Correspondent Chris Hansen brings us a Dateline hidden camera investigation.

Plus: Two beautiful, vivacious women meet a man online who seemed destined to change their lives. He sure did that. To one he promised opportunity and to the other, he offered love and money. But it turns out he was making lots of offers to lots of women - and walking away with their money. When you see who he was, and how he did it, you may be as shocked as the victims themselves. Dennis Murphy has the story of the Mysterious Music Man.

On Friday at 10 p.m. ET, viewers will be taken inside an unfolding investigation like never before. Dateline producers searched the country to assemble a team of law enforcement professionals to roll up their sleeves and work together to help solve two perplexing murders in North Carolina. Relying on insight, experience and instinct, Dateline's "Unsolved Case Squad" pieces through the evidence, discusses possible suspects and weighs theories about an unknown killer who so far has eluded justice.

Correspondent Josh Mankiewicz and law enforcement veterans Dwayne Stanton, Yolanda McClary and Alan Jackson come together to try and get to the truth behind the murders of Allison Foy and Angela Rothen, two mothers that went missing a year apart before their bones were found together last year in a wooded area near Wilmington, N.C. Stanton is a retired homicide detective from Washington, D.C. who investigated Chandra Levy's murder; McClary is a Las Vegas crime scene investigator who served as a model for a character on the hit series, "C.S.I.;" and Jackson is a prosecutor in Los Angeles who specializes in high-profile cases.
 
After the program, make sure to check out dateline.msnbc.com for web-exclusive videos and photos and to submit tips in the investigation.

Love at first sight: Does it really exist? It did for the couple in Friday's story: They decided to marry the day after they met! And it seemed to be one of those legendary marriages that everyone envied. Together for more than 20 years. So how could the story of this free-spirited couple who advocated peace and love end in murder?

DATELINE Correspondent Keith Morrison reports on the "Death of a Heartsong" Friday at 10 p.m. ET, 9 p.m. CT.