Is suicide still a sin if a mental illness drove you to kill yourself?
I don't mean that you kill yourself because you don't want to be mentally ill. I mean that you kill yourself because the mental illness prevents you from being rational enough to not kill yourself.
In case it isn't clear, I am specifically speaking of Robbin Williams taking his own life after being diagnosed with a mental illness that drastically changes ones's behavior. Normal Robin Williams would never off himself, but mentally ill Robin Williams had no defense against those thoughts.