"Compassion or Murder?" is the name of a "webquest" that guides you to make your own decisions about a series of cases: it "mercy-killing" or just "plain murder"?
Would you like to write a paper about the euthanasia, but aren't sure how to narrow such a topic? Take a look at this directory from Yahoo.com on the subject.
This page on the topic has links to plenty of resources about how the U.S. Supreme Court has ruled on the Constitutionality of doctor-assisted suicide in the U.S.
If you've decided to do research on some part of the life of Dr. Jack Kevorkian, the International Task Force on Euthanasia and Assisted Suicide has put together this collection of links that will get you started.