Ethics of Suicide

Is suicide wrong, profoundly morally wrong? Almost always wrong, but excusable in a few cases? Sometimes morally permissible? Imprudent, but not wrong? Is it sick, a matter of mental illness? Is it a private matter or a largely social one? Could it sometimes be right, or a "noble duty," or even a fundamental human right? Whether it is called "suicide" or not, what role may a person play in the end...