It was a machine. I think the other posters may have already described configuring it for plausiable deniability. It was no secret that this was a possibility, my relative told me and several others about a week before he finally used the opportunity. The end was good - as much as you can call dying of cancer good. It was indescribably hard to see him die, but it was even harder to see him suffer in agony being slowly eaten from inside by this terrible disease. I cried then and I cry now but more time would only have meant more suffering. I can't even call it a suicide. It had nothing to do with suicide, he didn't want to die. He wanted to stop the pain and there was no other way. Ending his life was the final pain relief.