Police release CCTV footage of an 83-year-old dog walker stabbed to death in an attempt to get witnesses to come forward.
More than 100 police officers joined an investigation after Peter Wrighton's body was found in woodland in Norfolk.
But a Home Office post-mortem examination later found the grandfather had been stabbed multiple times in the head and neck.
His body was found in woodland near East Harling, where he had travelled to walk his dogs, at 10.46am.
"My thoughts are with the victim's family and friends at this devastating time".
Speaking at a press conference at Norfolk Police's headquarters on Thursday, DS Smith appealed to people who may have been in the Harling Woods area.
They asking people who live within a five mile radius of the crime scene to check their bins for "a weapon or anything unusual", as a weapon is yet to be discovered.
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'When we think of Peter, we remember him with fond and happy memories that will stay with us always.' No arrests have been made after 5ft 7in Mr Wrighton, who had been married for 59 years, died on Saturday morning.
Police are still eager to speak to two other men.
A FORMER BT worker murdered while walking his dogs was a "lovely gentle husband, dad and grandfather".
One is aged 25 to 30, with tanned skin, was was wearing a grey or blue t-shirt, grey gym shorts and heavy-duty flip flops.
"We want to help Peter's family and the people in the local area to understand what happened", he said.
Inquiries are continuing. Anyone with information should contact Norfolk police immediately on 0800 056 0944 or 0207 158 0010, quoting "Operation Graduate", visit the mobile police station or alternatively contact Crimestoppers anonymously on 0800 555 111.