I have some suggestions that hopefully help.

Emery - as your voice fades
YouTube - Emery - As Your Voice Fades (acoustic live)

Hoobastank - crawling in the dark ; More about not knowing what to do with his life. Here's the lyrics:
http://www.azlyrics.com/lyrics/hooba...inthedark.html

Nine Inch nails- hurt (like already suggested)

Slipknot - Purity (might not help too much)
http://www.lyricinterpretations.com/...4e7e134c031e9c

Slipknot - My Plague
http://www.sing365.com/music/lyric.n...256AC0000BA356

Staind - waste (maybe)
http://www.lyrics007.com/Staind%20Ly...%20Lyrics.html

Poison the Well - pieces of you in me (id say thats pretty depressed)
http://www.sing365.com/music/lyric.n...256C630029818E

Flyleaf - Cassie; is about Columbine

Armor for Sleep did an entire album on the theme of death.

Maybe Something by Atreyu like "The rememberance Balad"
http://www.sing365.com/music/lyric.n...256EC500231507


Well, I just went through my collection of music that's on my laptop, that's all I could find. I hope that helps. Maybe some oldschool Linkin Park might hit the spot. All of these are more on the Depression note as opposed to the suiside, other than the slipknot (they blame everything in the world on them) and the song Cassie by Flyleaf. Hope it helps! I'll keep lookin