His devastated parents Barbara and William, of Stromness, travelled to the mainland after their son’s body was discovered.
Mr Miller’s parents, James, and Christine, from Finstown, also made the journey to Ayrshire. Mrs Robertson works with charities and voluntary groups.
The tragedy has raised fears the pair were influenced by Australian doctor Philip Nitschke, dubbed Dr Death, inventor of the so-called ‘Deliverance Machine’.
Pro-euthanasia campaigner Dr Nitschke’s device involved a computer connected to a syringe driver which could deliver a lethal dose of medication at the touch of a button.
This has just come like a bolt out of the blue.’Mr Robertson used to be in an indie-rock band in Orkney called Feedback.
He played a number of instruments but specialised in the guitar.
Critics have said they are a rich hunting ground for predatory intruders seeking to exploit the vulnerable.
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She said: ‘Jim was just the nicest, sweetest boy and everyone is in total shock. He was a gentle soul and always looked out for his friends.
But he had a dry sense of humour too and liked a joke.