When Colin was suddenly diagnosed with cancer, he joked to Iris that he'd like to come back as a fly on the wall just to be close to her. Surprisingly, he did.
Controversial euthanasia campaigner Philip Nitschke initially told media the Davidson father suspected of gassing his family had contacted his group – now he says he was mistaken.
His video has been viewed more than 35 million times – but was it right to film this intimate and heartwrenching moment and post for the world to see? Read why he did it.