Solomon carries out the deathbed wish of David by having Joab and Shimei murdered

You can tell a lot about a person by his or her last words. Take David’s last words, for example.

David asked his son Solomon to murder Joab for him.

Now the days of David drew nigh that he should die; and he charged Solomon his son, saying … thou knowest also what Joab the son of Zeruiah did to me … let not his hoar head go down to the grave in peace. 1 Kings 2.1-6

So Solomon sent Benaiah to murder Joab.

It was told king Solomon that Joab was fled unto the tabernacle of the LORD; and, behold, he is by the altar. Then Solomon sent Benaiah … saying, Go, fall upon him … So Benaiah … fell upon him, and slew him. 2 Kings 2.29-34

And another person that David asked his son to murder was Shimei.

Thou hast with thee Shimei … which cursed me with a grievous curse in the day when I went to Mahanaim: but he came down to meet me at Jordan, and I sware to him by the LORD, saying, I will not put thee to death with the sword. Now therefore hold him not guiltless: for thou art a wise man, and knowest what thou oughtest to do unto him; but his hoar head bring thou down to the grave with blood. 1 Kings 2.8-9

So Solomon sent Benaiah to “fall on” Shimei, too.

So the king commanded Benaiah ... which went out, and fell upon him, that he died. 1 Kings 2.44-46

God, of course, wanted these people murdered, too. God approved of everything David did, except for the matter of Uriah (1 Kings 15.5).

God's next killing: A tale of two prophets