i remember that kurt and artie were supposed to be giving a presentation together for a class (may have been schue's class? i don't remember). anyway, artie starts talking first, and when it's kurt's turn to read off his bit, he's silent. artie is initially annoyed at kurt making them look bad, but then kurt collapses to the floor. in short order, he is pronounced dead, and the cause is an aneurism (they may have worded it differently; i just remember something went wrong with his brain suddenly and without warning). i'm pretty sure it was a oneshot/one chapter thing.
hope someone remembers this. it's driving me crazy.
found! it's just a headache by niblettk