Rachel Nickell was stabbed 49 times
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Police investigating the 1992 murder of model Rachel Nickell are continuing to question a 40-year-old man.
The 23-year-old mother was stabbed 49 times and sexually assaulted on Wimbledon Common in south-west London.
It is believed the man is an inmate at Broadmoor Hospital and was identified for questioning following a breakthrough in DNA testing.
Ms Nickell had been walking with her two-year-old son when she was murdered. The killer has never been caught.
The police said the interview was part of an ongoing inquiry into her murder.
In 1994, Colin Stagg was tried for the murder but the case was thrown out on the grounds that police had used a "honey trap" plot to encourage him to confess.
Mr Stagg told Sky News he would never be able to escape the consequences of being linked to the murder.