The killer is , a teenage girl who was in Lydia’s adult creative writing class.
But the show adds one more devastating twist: Melanie doesn’t even remember doing it. She tells the barrister that she “woke up” standing over the body. She genuinely believed that Ben had done it. Her mental state—a fugue of rage and dissociation—becomes the final piece of the puzzle. So, who was the killer in Criminal Justice season 1? Melanie, the forgotten student. who was the killer in criminal justice season 1
If you’ve just finished binge-watching the series (or the later BBC remake that inspired The Night Of ), you know the answer isn’t straightforward. The season builds a complex web of suspicion, only to pull the rug out from under the audience. Here is the full breakdown of the killer’s identity, the motive, and why the reveal is so haunting. Before revealing the killer, let’s revisit the setup. Season 1 follows Ben Coulter (played by Ben Whishaw), a young, aimless man living in London. One night, he borrows his father’s cab to impress a mysterious, beautiful passenger named Lydia Miller (Anne Frank-narrator Saskia Reeves). After a night of sex and drugs, Ben wakes up in Lydia’s bed, covered in blood, with Lydia brutally stabbed to death beside him. The killer is , a teenage girl who