Suicide is not justified. It is violation of nature’s law. Nature gives you a certain type of body to live in it for certain days, and suicide means you go against the laws of nature, you untimely stop the duration of life. Therefore he becomes a criminal. Suicide is criminal even in ordinary state laws. One cannot make suicide.

From Srila Prabhupada’s lecture on Bhagavad-gita 2.9 — 21 February, 1973