In the thirty-eighth year of Azariah king of Judah, Zechariah son of Jeroboam became king over Israel in Samaria. He lasted only six months.
He lived a bad life before God, no different from his ancestors. He continued in the line of Jeroboam son of Nebat who led Israel into a life of sin.
Shallum son of Jabesh conspired against him, assassinated him in public view, and took over as king.
The rest of the life and times of Zechariah is written plainly in The Chronicles of the Kings of Israel.
That completed the word of God that was given to Jehu, namely, "For four generations your sons will sit on the throne of Israel." Zechariah was the fourth.