Sometimes with people with this illness its the schizophrenia which kills them rather than the suicide if they are that unwell the voices trick them into it or they unwittingly kill themselves.
Someone I know from the psych services unwittingly jumped to her death off a high building beliving she could fly.
Another of my friends made a potion outof boiling all the medication in the house she could find and was planning to drink it as the voices told her it would immortalise her. She was lucky to escape death.