5 Things You Need to Know Monday - Was B.B. King murdered, Dekalb man killed by train, look younger in pictures if you do this and 4 TV premieres tonight.

BB Kings daughters allege he was murdered. (CNN)

Dekalb man killed by train. (My Stateline)

Smiling in pictures makes you look younger. (Daily Mail)

New Research Finds the Secret to a Happy Marriage
Wavebreakmedia Ltd, ThinkStock
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Secret to a good marriage is a husband who doesn't let himself go. (Daily Mail)

TV TONIGHT

The 10th season premiere of America's Got Talent at 7 p.m. on NBC.

The 6th season premiere of Are You Smarter Than a 5th Grader at 7 p.m. on Fox.  The show's been off the air for a few years, but Jeff Foxworthy is back for the revival.

The 5th season premiere of Extreme Weight Loss at 8 p.m. on ABC.

The series premiere of I Can Do That at 9 p.m. on NBC.  Marlon Wayans hosts this six week series where six celebrities compete in a variety of talent competitions to be named the best all around entertainer.

Nicole Scherzinger, Joe Jonas, Cheryl Burke from Dancing with the Stars", Ciara, comedian Jeff Dye, and Alan Ritchson (the guy who played Aquaman on Smallville and is Raphael in the new Teenage Mutant Ninja Turtles movies. In the first episode, they perform with the Harlem Globetrotters, Penn and Teller, and the aerial theater company AiRealistic, who do Cirque Du Soleil-type stunts.