https://www.lds.org/ensign/1987/10/s...o-not?lang=eng
President Spencer W. Kimball made an equally strong statement in 1976. “It is a terrible criminal act for a person to go out and shorten his life by suicide,” he said. (Teachings of Spencer W. Kimball, ed. Edward L. Kimball, Salt Lake City: Bookcraft, 1982, p. 187.)

Those statements on their own might seem to leave no room for hope. However, although they stress the seriousness of suicide, the statements do not mention the final destination of those who take their own lives.

The late Elder Bruce R. McConkie, formerly of the Quorum of the Twelve, expressed what many Church leaders have taught: “Suicide consists in the voluntary and intentional taking of one’s own life, particularly where the person involved is accountable and has a sound mind. … Persons subject to great stresses may lose control of themselves and become mentally clouded to the point that they are no longer accountable for their acts. Such are not to be condemned for taking their own lives. It should also be remembered that judgment is the Lord’s; he knows the thoughts, intents, and abilities of men; and he in his infinite wisdom will make all things right in due course.” (Mormon Doctrine, Salt Lake City: Bookcraft, 1966, p. 771; some italics added.)