The First 48: Season 12, Episode 120

12 - 120:

After a 17-year-old girl is found with a bullet through the back of her head in the woods of Katy, Texas, a young man comes forward who claims to be an eyewitness. Investigators are shocked by the unusual deal he s made with the DA. Is the eyewitness telling the truth -- or is he involved in the murder? And will the prosecution convince the jury that the defendant is the real killer?