Again, back up the point of self harm being a sin.
Keep in mind that nobody knows the disposition of his soul at death, and nobody knows his eternal destiny. Only God can judge, in the particular case, whether the suicider was drunk, or crazy, or clinically depressed or otherwise out of his right mind.
But according to the Bible, we (our bodies) are to be treated reverentially, because our lives do not belong to us but to God. We say this every time we say the Creed: the Holy Spirit is the Lord and Giver of Life.
We do not have right to kill ourselves. If we do so with an adequate degree of self-awareness (i.e. not reacting to a drug, not paranoid schizophrenic, etc.) it is self-murder and as culpable as any other murder.
Galatians 5: 21 - no murderers will enter the Kingdom of Heaven.
Envyings, murders, drunken revellings, and such like: of the which I tell you before, as I have also told you in time past, that they which do such things shall not inherit the kingdom of God.
Unless, of course, such a murderer should repent.
The worst thing about self-murder is that you are cutting short your chance to repent. Such persons are in desperate peril of their souls.
We should all pray both for the dead boy and for his family.