Police have released more CCTV footage in the hope of tracing three people stood at a bus stop in Truro with a man matching Alan Jeal's description.
The footage shows the man, believed to be Alan, talking to someone at the bus stop at 6.45pm on Monday 24 February at the Lemon Quay bus station.
Two other people were also waiting for the bus, destined for Perranporth, at the same time.The man, thought to be Alan, is wearing a blue jacket and a rucksack, and has a beard.
DCI Dave Thorne, Senior Investigating Officer, said: "We are keen to speak to these three individuals, particularly the man who was talking to the man believed to be Alan, as they may hold vital information about where he went next."It is not clear from the footage whether Alan got on the bus or walked away.
Alan's body was discovered on Perranporth Beach by a member of the public while out walking his dog at around 2pm on Tuesday 25 February.
He was naked apart from wearing socks and one walking shoe.Alan, 64, from Wadebridge, lived alone and was not reported missing to the police. Multiple injuries were found on his body which are inconsistent with drowning and cannot be easily explained.
Police are using CCTV to trace his last movements on Monday 24 February, the day before his body was found.