He was made the captain of David's army (2 Samuel 8:16; 20:23; 1 Chronicles 11:6; 18:15; 27:34). He had two brothers, Abishai and Asahel. Asahel was killed by Abner, for which Joab took revenge by murdering Abner (2 Samuel 2:13-32; 3:27).However, according to Josephus, in Antiquities, Book 7, Chapter 1, Joab had forgiven Abner for the death of his brother, Asahel, the reason being that Abner had slain Asahel honorably in combat after he had first warned Asahel and had no other choice but to kill him out of self defense. This battle was part of a civil war between David and Ishbosheth, the son of Saul.
However, David could not bring himself to harm his son, and ordered that none of his men should kill Absalom during the ensuing battle. However, when a man reported that Absalom had been found, alive, caught in a tree, Joab ordered his men to kill him (2 Samuel 18:1-33).
Joab was buried in 'the wilderness' (1 Kings 2:34). It is interesting to note that Joab fled to the Holy Temple and told Benaiah that he will die there. Benaiah, as ordered by King Solomon, kills Joab in the House of Yahweh.
Source: Wikipedia > Joab
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