Killer Among Friends is typically not based on real events. It's more in the realm of fictional storytelling, crafted to engage and thrill the audience.
In fact, 'A Killer Among Friends' has roots in true events. Some elements might have been fictionalized for dramatic effect, but the core concept originated from reality.
Well, it could be about a real - life situation where a killer was found among a group of friends. Maybe it was a case of betrayal, jealousy or some hidden motives that led one friend to harm others within the friend group.
One example could be the case of Mary Bell. She was a child killer who killed two toddlers when she was just a child herself. She was part of a community, had friends around her, but she had this very dark side. It was a shock to everyone who knew her, even if just on the periphery.