NET
5 When he had secured control of the kingdom, he executed the servants who had assassinated his father.
Darby
5 And it came to pass when the kingdom was established in his hand, that he slew his servants who had smitten the king his father.
KJV
5 And it came to pass, as soon as the kingdom was confirmed in his hand, that he slew his servants which had slain the king his father.