1991 Dr. Timothy Quill writes about "Diane" in the New England Journal of Medicine, describing his provision of lethal drugs to a leukemia patient who chose to die at home by her own hand rather than undergo therapy that offered a 25 percent chance of survival.
From this website:
http://64.233.161.104/search?q=cache:iNhofGNxArIJ:www.finalexit.org/chronframe.html+euthanasia+society+america&hl=en&ie=UTF-8
Ping to 37 if your interested in more about "Dr." Timothy Quill. I use quotation marks because I find little of his work to be really that which I expect of a doctor. Too Kevorkian for me.