The mother of a 25-year-old man killed at a party at former world boxing champion Herbie Hide's home has issued a heartfelt plea for people to come forward with information, after the case against a man charged with his murder was dismissed in court.

Police have relaunched a murder probe after the Crown Prosecution Service today offered no evidence at Norwich Crown Court in respect of Joshua Burton, 21, of Fallowfield Close, Norwich, who was the man accused of killing Tafadzwa Khan (known as Taffy) at a party in Bawburgh, near Norwich, on March 18 last year.

Afterwards, Taffy's mother Shereen Sinclair said: 'People need to come forward if they have any information about what happened to my son. I know there is a wall of silence and people might be frightened, but my family and I need to know how Taffy was taken away from us.

'After the decision at court, I do not want anyone to take the law into their own hands. I don't want another mother to be crying like I am. Please tell the police if you have any information that might help.'

Detective Superintendent John Brocklebank, head of the Norfolk and Suffolk major investigation team, said they would now refocus their efforts into bringing to justice those responsible for Mr Khan's murder.

He said: 'We know there are people who were at the party in Bawburgh and know what happened, but have not come forward. It was a busy party with guests from across the country, but only a small number of them have been able to assist the investigation so far.

'They may have felt scared or intimidated – but their help is vital to give answers to Taffy's family, and I would urge them to contact police. We will treat any information we receive sensitively and in confidence, so I want all those who attended the party to think back to a year ago and call the MIT with any information, however insignificant it may seem.'

Frank Ferguson, senior district prosecutor for CPS East of England, said he had explained the reasons for the decision to Mr Khan's mother. 'I also offer my condolences to his family for their loss,' he said.

As reported, police were called to reports that a man in his 20s had been stabbed, at Mr Hide's home in Long Lane, just after midnight on March 18.

A private party was underway at the property with between 100 and 300 people in attendance. Paramedics attended the location but Mr Khan, of St Giles Street, Norwich, was pronounced dead at the scene. Mr Hide won the World Boxing Organisation heavyweight title for the first time in 1994.

Anyone with information about the murder should call the Norfolk and Suffolk Major Investigation Team on 101.

david.bale2@archant.co.uk