MURDER detectives today said their hunt for a killer on the loose for more than eight months is being thwarted by a lack of public help.

Calls for the genetic fingerprints of all males aged over 14 in Sutton-on-the-Forest and Huby, near Easingwold, have been answered by only 100 people - a third of the expected response.

Hundreds of those who stayed away from the testing site may now be contacted and asked why they have not attended.

DNA samples are being taken to eliminate people from inquiries into the murder of 58-year-old bachelor David Williamson.

He was found with a fractured skull only yards from his Sutton-on-the-Forest home in March.

Police discovered a DNA trace near the body, which they believe could be that of his killer.

Detective Chief Inspector Nigel Boynton, who is leading the inquiry, said: "We have had about 100 people come in for testing. We had expected 300.

"We are taking samples in the village until Sunday, and are hoping for a rush over the next couple of days, but we are very disappointed.

"We may decide to contact those we haven't seen and ask them why they haven't been tested."

All 800 males aged over 14 in the two villages were sent letters. Tests, involving a sample of saliva taken with a cotton wool swab, have been carried out since November 19.

DCI Boynton said: "We'll think about the next move after Sunday, but it is quite possible we will be getting in touch with those who stayed away. It is voluntary and we can't make people take part in the tests, but we would want to find out why people haven't.

"If anybody does have any concerns about the tests, then we will be pleased to talk about them in confidence."

Sutton-on-the Forest resident Alan Cundall blamed the end of beat bobbies for the poor response.

"Years ago round here everyone knew the local bobby. He was everyone's friend. Now you see them pass through in their cars without stopping and every time it's a different bloke. The trust has gone," he said.

Mr Cundall, of Easingwold Road, admitted he had not taken the DNA test yet, but said he would do soon.

David Wharton-Street, of Grey Close, said "every relevant family member" had taken the test so far.

He said: "The police have a job to do and it is in everybody's interests that this reported murder is settled."

The tests are taking place in the tea room at Sutton Hall, in Main Street, Sutton-on-the-Forest, until 10pm on Sunday.

Updated: 11:56 Friday, November 30, 2001