But, if you are simply asking that old question, "Can a Christian commit suicide?", "Could he/she have been saved?", etc, I found a recent response by Michael Patton very helpful.
The blood of Jesus Christ cleanses (present tense; 1 John1:7) us from all sin, not just some sins.
Christ's death is a once for all remedy to our damnation. Because of this grace and forgiveness we should live a life that is pleasing to him, but some of us won't do so well. That is what makes grace so wonderful and radical—indeed, beyond belief.
Be sure to read the whole thing.