"...was controversial..."
"The concept of a doctor assiting suicide was controversial within the US at the time and he was known as "Dr Death"."
I believe it still is highly controversial. Maybe the word 'particularly' in front of 'controversial' would better describe the atmosphere in the U.S. of the time. Also, 'assisting' is missing an 's' in the article.
You're right! It is still highly controversial. Only three states out of fifty allow physician assisted suicides, and those three states have many restrictions, provisions, requirements and safeguards before it is allowed. For example, in Oregon the medication must be self-administered in the presence of a physician.
As an outsider, I'm not at all surprised it is controversial. The problem is keeping within what the sources say; they don't really talk about the present situation. The information would need sourced and the deadline for additions to the article is almost here.
As for the typo, I'll go deal with that.