emma walker was a spirited teenager with a knack for stirring up fun. pretty and smart she had her whole life ahead of her. after her death detectives faced a tough investigation. whoever shot emma had been brazen and it would take a bold plan to catch her killer. here's "noises in the night." >> when the autumn chill seeps into this community just north of knoxville, tennessee hundreds of high school students are drawn to the blaze of friday night lights. to cheer on their hometown heroes the bobcats. she was the friday night light who perhaps shown brightest of them all. emma walker, a bobcats cheerleader since her freshman year at central high. >> she was a really good cheerleader. some cheerleaders just go through the motions but emma put her own kind of sparkle i guess into what she would do. >> fellow cheerleaders kelsey and lauren said their friend emma could be sassy, too. >> she'd always say, well, i am kind of a big deal. >> and i take it she said that with a hint of sarcasm? >> yes. people who didn't know her were like oh, she's super pretty c