Why did David command Solomon not to let his army commander Joab die a natural death?

ANSWER

Joab murdered the great Abner and Amasa for personal reasons

1st Kings 2 :

(5) “Now you yourself know what Joab son of Zeruiah did to me—what he did to the two commanders of Israel’s armies, Abner son of Ner and Amasa son of Jether. He killed them, shedding their blood in peacetime as if in battle, and with that blood he stained the belt around his waist and the sandals on his feet. (6) Deal with him according to your wisdom, but do not let his gray head go down to the grave in peace.
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