Netflix’s new documentary The Murder of Rachel Nickell has brought renewed attention to the 1992 killing of 23-year-old Rachel Nickell. The documentary revisits how Robert Napper, a serial sex offender and later convicted killer, escaped detection for years while authorities focused on an innocent suspect, Colin Stagg. Robert Napper, a serial rapist, was free and continued to perpetrate horrific crimes until ten years later, DNA evidence connected him to Rachel Nickell’s murder. (Netflix) Napper, a serial rapist, was free throughout that period and continued to perpetrate horrific crimes until nearly ten years later, when improvements in DNA technology ultimately connected him to Rachel’s murder. Rachel Nickell was murdered on July 15, 1992, while walking her dog on Wimbledon Common in London with her two-year-old son, Alex. She was sexually assaulted and stabbed 49 times in broad daylight. Alex, who was unharmed physically, became the sole witness to the attack. Netflix has also released a dramatized series, The Witness, that hinges on Alex and his account of Nickell’s murder investigation. Read more: The Witness on Netflix: …