Senior coroner Jacqueline Lake told Norfolk Coroners' Court that Mr Wrighton had left his home in Banham, Norfolk, earlier in the morning to walk his dogs. Detective superintendent Andy Smith.
CCTV of Peter at Keninnghall Post Office at 10.08am to 10.12am on Saturday 5th.
On Friday, police said they had traced one of three "vital" potential witnesses - a man in his 50s seen changing into a T-shirt - but they said they still wanted to speak to two other men. He had been out walking his dogs at the time.
Detectives investigating the murder of Peter Wrighton have said they will be "exploring all avenues" in their enquiries.
While no weapon has been recovered, and police have so far been unable to establish a possible motive for the killing, a witness has come forward claiming two elderly men were arguing in woods close to where Mr Wrighton's body was found. Police described his murder as a "brutal knife attack".More news: Required Viewing: The Opening of Last Night's Rachel Maddow Show
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■ White man, aged over 50, of a slim build with pale skin with grey or white hair which is balding on top.
He was believed to be wearing heavy-rimmed glasses and light-coloured pants, and was seen in The Street changing into a white t-shirt. We have received more than 100 calls in the last three days and we would continue to urge people with information, particularly those who were in the area between 9am and 11m, to make contact.
Norfolk Police has also released a poster appealing for information.
The third man is described as a white male, aged 30 to 50, of medium build, who wore dark-coloured clothing and was seen walking without a dog in the northern area of the heath.
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.