The detective urged anyone driving in the area, specifically the A82, between 1 and 13 September to contact police.

He said searches of the area will continue alongside door-to-door inquiries.

He added: “We are also appealing for information from anyone who was onboard a boat, or any other vessel, or anyone who may have been using the water near to Firkin Point for any purpose around this time.

“Please be reassured we are doing everything we can to get answers and there will be a large police presence as these inquiries continue.”

Supt Mark Stirling said: “I would like to extend my sympathies to Graham’s family and friends as they try to come to terms with their loss.

“We understand the significant impact this will have on the local community and I would like to thank everyone for their help so far.”