Absolutely, an individual should ultimately have the right to die if they so choose. Obviously, it's not a decision to be taken lightly, and, ideally, suicidal or depressed people should have access to some sort of counseling before they ever get to that point. But in the end, it is still each person's fundamental right to choose to live or die.
There was an episode of Star Trek: TNG that had this topic as a theme. A particular race instituted a policy where, when people reached a certain age, ritual suicide was mandatory. The idea was for a person to die at a late age in life, but before they could descend into senility and general decreptitude. It helped the family & the individual preserve & celebrate the memory of the individual as a vibrant person, without the burden and trauma of dealing with that person's slow decline.
It was an interesting idea, but not one I entirely agree with (mandatory suicide at a specific age? Not likely!) I think allowances for ritual suicide could be / should be possible at some point in the future. But in a heavily Christian U.S., the idea would face pretty stiff opposition.
