Mass DNA screening has begun in a Sussex village as police try to crack the unsolved murder of a grandmother.
Valerie Graves is believed to have been killed with a claw hammer as she house-sat for friends in Bosham on 30 December, 2013.
Men over 17 who live, work or visit the area have been urged to voluntarily give a DNA sample to rule themselves out of the inquiry.
They are being asked to have a mouth swab done and provide a thumbprint.
Detective Superintendent Nick May, from Sussex Police, explained a thumb print and a swab would be taken from the inside of the person's cheek in a process that would take no longer than 20 minutes.
He said: "It's then packaged up and couriered to our forensic provider where the samples taken here are compared against the profile of the person that we believe murdered Valerie.
"If that's a negative then the samples taken here are destroyed.
"There are really strict, legal safeguards in place to ensure that we treat those items with respect and that we do not use them for any other investigation."
He went on: "This is part of a thorough investigation. What we are looking to do here is to eliminate the people who live in and around Bosham so that we can actually make the pot of people we have been looking at smaller.
"We in Sussex have not done a mass screening like this for some considerable time.
"However, there are examples elsewhere in the country where it has been successful.
"We are very confident that we will find the murderer of Valerie Graves."
More than 9,500 people have been interviewed over the past year and police have a limited DNA match of a suspect.
Ms Graves was looking after the house near Chichester with her mother, sister and her sister's partner while the owners were abroad over Christmas.
She was discovered by one of her relatives in a ground floor bedroom.
A post-mortem examination revealed she had suffered significant head and facial injuries.
Ms Graves' death shocked the people of Bosham - a village which featured in an episode of the ITV crime drama Midsomer Murders.
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