To sum it up - You always know you are dreaming. In LDs, you and your SC knows that. In NDs, only your SC knows that. Therefore, if You will kill yourself in a Normal Dream, Your SC will know it is a dream and will either wake you up, or bring you to an afterlife.
If you die In an LD, the same will happen.
Even if you do get control over your physical body, and you do stop yourself from breathing, you will still not die. People just can’t strangle themselves.
If your air vents will be blocked by a pillow or such, you will wake up.
Therfore, you can’t die in dreams, unless you cause yourself a heart attack.
This topic was locked early so the next part could begin with dreaminghamster’s post Dying in dreams - Part II 