There's a lady mrs goes to see, mid 50's, totally with it, but fell down the stairs a couple of years ago and is almost totally immobile. When my mrs went to see her one day earlier this year, she had gone. Turns out she had flown to Dignitas in Switzerland to end it all.
My mrs was questioned by the police to see if she had known she intended to do this and a couple of women they suspected of helping her to get there were arrested. Not sure what happened to them, but helping someone who can't walk onto a plane surely can't be counted as assisting a suicide?