Kevorkian, Natural Rights and Right to Death

Jack Kevorkian has been arguing that the right to end suffering is one of our natural rights and wrote a book called "Amendment IX, Our Cornucopia of Rights," which spells out his theory on natural rights.
http://www.freep.com/apps/pbcs.dll/article?AID=/20070606/NEWS03/706060368/1001

There are good reasons in my view to allow people to end their lives when suffering. But arguing that it is a natural right is the wrong way to approach the issue. Natural rights are problematic for several reasons. Not only is the conception of natural rights problematic in general, but the original theory of natural rights would not have endorsed the right to end one's life. In John Locke, who is the most prominent exponent of natural right theory, one does not have a right to commit suicide or sell oneself into slavery. This is because Locke argues that we are all the workmanship of God and as the product of God's labor, we have no right to take our lives. Indeed, we don't even own our bodies. This by the way is the same reason that Locke gives for the rights to life. Since everyone is the workmanship of God, one person can't take another person's life. The classical natural rights tradition therefore would disagree that there is a natural right to end one's own life. There are good reasons to allow people who are undergoing terrible suffering to end their lives. But basing it on an argument from natural rights is not the right way to justify the argument.

I have talked about Locke's view of of Suicide and human's being the workmanship of God in my essay on Suicide @ http://www.freedomandcapitalism.com/