I would like to answer the question with the quote from Bishop Tom Brown. He says "Committing suicide is not a sure ticket to hell, because there is no ticket to hell. It is the other way around, Jesus is the ticket to heaven, however, Jesus said many will say that He is Lord, but He will reply, "Depart from me." Faith is not simply mentally agreeing to the facts of the gospel, but being changed by the gospel. And then one must continue in faith and not give in to unbelief. There is no "once saved, always saved" promise from God. Even if it were true that someone was saved, that does not mean that his or her salvation is "unconditionally secured." One still must persevere and trust God to the end, not end their lives through suicide"
For more info please visit: http://www.tbm.org/willsuicide.htm