He was a troubled man whose boyhood fascination with one of the world's greatest stars turned into a psychotic obsession. The shots he fired spelled the end to whatever innocence was left in rock and roll. Mark David Chapman was one of John Lennon's biggest fans. Before he killed the iconoclastic superstar he made sure to get his autograph the last one Lennon ever signed. After he fired four shots from across the street as Lennon entered Manhattan's Dakota apartment building he waited calmly for police to arrest him. Six months later he was sentenced to 20 years to life. AMERICAN JUSTICE revisits the tragedy through interviews with many of the parties involved including Chapman's attorneys the arresting officer and in a rare taped interview from his cell Chapman himself. Forensic psychiatrists explore the twisted fantasy of Chapman's life where the line between celebrity worship and stalking blurred into indistinction. Dramatic footage of the crime scene and aftermath bring the incident to life and legal experts examine the possibility that Chapman will be freed he is eligible for parole in 2000. It's a comprehensive chronicle of the murder that stunned a generation.