amber belken was a force to reckon with. a pet young woman whose big dreams and drive made her seem unstoppable. then she was found murdered. was amber the victim of a robbery gone bad? or was this brutal crime personal? three people knew the truth. two of them would risk their lives to reveal it. here's keith morrison with "everything she knew". >> it was a monday morning in january, 2007. 9:08 am. a young woman in san antonio texted her boyfriend, "i love you." that's all it said, i love you, nothing more. downtown, the alamo had just opened its doors. a few tourists began boarding little boats to gaze at remnants of texas is history. along urban stretches of the san antonio river. several miles away, in the for the reaches of the modern city, the manager of the video game store began his daily ritual. his name was mariano rivera. >> the store opens at ten but the managers typically get their nine in the morning. get the chills ready, grab the money and go to the back. >> a similar process at the sister store, same company,