 On 24 January 2008, he pleaded not guilty to Nickell's murder and faced prosecution for the murder of Rachel Nickell in November 2008.On 18 December 2008, at the Old Bailey, Napper pleaded guilty to the manslaughter of Rachel Nickell on the grounds of diminished responsibility.Mr Justice Griffith Williams said that Napper would be held indefinitely at Broadmoor because he was "a very dangerous man".