The Rachel Nickell case

Rachel Nickell, who was found dead on Wimbledon Common in July 1992 Photograph: /PA

Police searching dense undergrowth on Wimbledon Common after they received fresh information about the killing of the young mother Photograph: Adam Butler/PA

Wellwishers lay flowers close to the spot on Wimbledon Common where Rachel Nickell was killed Photograph: /PA

Police search the woods where the body of Rachel Nickell was found Photograph: John Stillwell/PA

A reconstruction of the killing of Rachel Nickell. A woman who knew Rachel retraced her fatal last steps in the hope of jogging witnesses memories as police continued the hunt for the brutal killer Photograph: Adam Butler/PA

An artist's impression of the suspect in the Rachel Nickell murder inquiry Photograph: /PA

Colin Stagg issues a statement to the media outside the Old Bailey after he was cleared of Rachel Nickell's murder in 1995 Photograph: PA

Robert Napper (left) is driven away from the Old Bailey in 1995 after being detained indefinitely for the murder of Samantha Bissett, 28, and her daughter Jazmine, aged four, 12 miles away from Wimbledon Common. Today, Napper pleaded guilty to Rachel Nickell's killing Photograph: Mark St George/Rex Features