If you mean to imply that suicide is an unforgivable sin, Ive searched and never been able to see that it too isnt forgivable. The only unpardonable sin is to reject Jesus imo.
Was their a suicide note? How did they determine it was suicide?
The only unpardonable sin is to :
Matthew CH 12:32
And whosoever speaketh a word against the Son of man, it shall be forgiven him: but whosoever speaketh against the Holy Ghost, it shall not be forgiven him, neither in this world, neither in the world to come.