Antoine Da Silva, a retired council worker and neighbour of Andrew and Dawn, shared how he saw the dad-of-two hurrying through the village making an "agitated" call in the days before he died.
Mystery shrouds retired couple Dawn and Andrew Searle's final hours in their tranquil French home.
Investigators have also revealed that no weapons were found at the scene of the crime, and no bullet or knife wounds were found in an initial examination of the bodies, as per a source close to the investigation.
He said: "I saw them the day before they were found – they were walking the dogs and Andrew was on the phone.
Andrew and Dawn's mobile phones are being examined and are said to be providing "vital clues" about how and why they died, according to detectives.
