Question

1. He will[no accent] die.
(simple future tense; "will" indicates natural result, guessing or possibility)
2. He shall die. (the volition of the speaker)
= I will kill him.
3. He will[wíl] die. (the volition of the subject)
= He intends to die. He wants to die willingly.
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Would you check the sentences and my explanation for them? Is the explanation plausible?

Answer 1

1. "will" indicates future tense; he will die -- no alternative. If you want possibility or guessing, then use "would," "could,"or "might."

2. Correct

3. Correct.

Answer 2

Traditional healers should be allowed to practice and prescribe medicine in hospital and clinic