Do people have a "right" to commit suicide?

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You see it and hear about it on the news all the time. A terminally ill elderly person commits suicide and their spouse/friends are under investigation to see if they "helped" the peron die or not. A person who loses their home and/or job commits suicide rather than start over. A teenager who is under too much stress commits suicide. Etc., etc., etc. Oregon, Washington, and Montana have passed legislation that says a person has the right to decide when and how to end their life AND they can request and receive assistance. The rest of the states make it a crime to assist someone when they decide to commit suicide and some states actually make suicide itself a crime (but, I don't know what good it does to charge them with a crime if they are dead). So, what do you think/beleive? Does a person have a "right" to decide when and how to end their own life? Should there be limits - age restrictions, previous counseling, terminal illness only, etc.? Do they have the right to ask for and receive assistance?