Some were caught decades later, like the Golden State Killer, whose identity remained a mystery for over 40 years before DNA evidence finally led to his arrest. Others like the BTK killer managed to live seemingly ordinary lives, raising families and holding steady jobs, all while hiding horrific crimes committed over decades. Despite advancements in forensic science and profiling, many serial killers continue to evade capture, their names unknown and their crimes unsolved. They may have blended back into society, changed identities, or passed away unnoticed. The terrifying truth is that some of them could still be out there living quietly, hiding in plain sight.