KILLER Kevin Nunn was last night urged to come clean over how and why he murdered his former girlfriend Dawn Walker.The plea, made by the family of Miss Walker, detectives involved in the case and a Crown prosecutor, came as 45-year-old Nunn began a 22-year sentence for murder.

KILLER Kevin Nunn was last night urged to come clean over how and why he murdered his former girlfriend Dawn Walker.

The plea, made by the family of Miss Walker, detectives involved in the case and a Crown prosecutor, came as 45-year-old Nunn began a 22-year sentence for murder.

Nunn, formerly of Woolpit, denied killing Miss Walker, whose body was found near the River Lark, in Fornham Park, on February 4 last year, but was found guilty on Monday by a jury at Ipswich Crown Court.

As well as calling for Nunn to finally reveal exactly what happened during the last hours of 37-year-old Miss Walker's life, police said there was “another person out there involved” in the case and welcomed any further information people may have.

Following the acquittal of a man accused of helping dispose of Miss Walker's body, the lead officer in the case, Detective Superintendent Roy Lambert, said: “It stands to reason that there is another person out there involved with this offence, and if anybody has additional information I would like to hear from them.”

Miss Walker's sister Kirsty said: “Everyone wants the truth. Of course we want to know - but only time will tell. Nunn knows what he has done and he's got to come to terms with that. He may never tell, but it is really in his hands.

“In the meantime, if the police can find someone else involved, then that will be even better.”

Det Supt Lambert said he too hoped Nunn would explain what happened - although conceded it was unlikely to happen.

And Crown Prosecution Service's lead prosecutor in the case, Robert Sadd, added: “Unless in later life Nunn tells us what happened, there will always be unanswered questions.

“One of the things that makes this doubly difficult for the victim's family is they do not know precisely what happened. The only decent thing is for Nunn to say what happened.”

He told how the police and the CPS gathered together more than 6,500 documents during the two-year investigation.

The process involved speaking with everybody who lived in the area around Miss Walker's home, everybody she worked with, all her mobile telephone records and every CCTV image which might have shed light on the case.

Mr Sadd, who was brought in by the police within the first fortnight of Miss Walker's body being found, said: “There are two types of murder of inquiry. The first is the Hercule Poirot type, where you have four people in the room and one of them has to have done it. The second, as in this case, is where you have no suspects and you are going through everybody eliminating people who appear to have cases to answer. The only case to answer was left with Kevin Nunn.”