Those who take their own life have certainly left God out. He is the answer to ALL our trouble, no matter how extensive that trouble may be. Those who resort to ending their life have chosen to reject God, and therefore end any further opportunity to make Him Lord of their lives. God rejectors will not make it to God's Heaven. Murder is the unlawful premeditated killing of one human being by another.
Suicide is simply self-murder.
We would have to believe that one who commits suicide has truly chosen a route of unbelief in God. They are saying by their action that even God cannot offer hope in whatever situation they may be. Suicide is a willful act of unbelief. Jesus gave His life so that we would not have to die. HE paid the price that we could never pay.