The First 48: Season 12, Episode 109

12 - 109: The Girl Who Knew Too Much / The Guardian

In January of 2009, Louisville resident Billy Wagner was killed in the street by a single bullet to the back of the head. After nearly two weeks, Det. Rick Arnold charged 20-year-old Gary Lindsey with murder, but the story was far from over. At trial, a young prosecutor faced off against a power veteran defense attorney. And the jury had to decide: Was the killing self-defense or murder?