HALO 3 Ending **Spoiler**

[Reza]

if you havnt bought HAlo 3 and you still want to then stop reading now.okay for those of you that did and have finished the game dont you think its stupid that master chief dies. If you read the advertisements or look at the posters then on top it says " A HEROE NEVER DIES".
doesnt that not make sense

 

[raVid]

Straight off Wikipedia:

If the player waits through the closing credits, a scene reveals that the Master Chief and Cortana have in fact survived in the rear section of the ship. Cortana explains that the slipspace portal became unstable from the catastrophic Halo activation, and they are drifting helplessly through space. Cortana activates a distress beacon, noting it might be years before they are rescued, and the Master Chief climbs into a cryo chamber to await rescue.

http://en.wikipedia.org/wiki/Halo_3