2 Kings 12:20
And his servants arose, and made a conspiracy, and slew Joash in the house of Millo, which goeth down to Silla.
Cross-reference
In 2 Kings 14:5, Amaziah kills the assassins of his father Joash, directly avenging the conspiracy.
2 Kings 14:19 reports a conspiracy against Amaziah, another assassination of a Judean king.
2 Kings 21:23 details Amon's officials conspiring and killing him, mirroring Joash's fate.
In 2 Chronicles 24:24, the Syrian defeat of Joash's army precedes the conspiracy, providing context for his assassination.
In 2 Chronicles 24:25, the parallel account describes the same assassination with added motive (blood of Jehoiada's sons).
1 Kings 15:27 describes Baasha's conspiracy against Nadab, paralleling the conspiracy against Joash here.
1 Kings 16:9 recounts Zimri's conspiracy against Elah, a similar pattern of royal assassination.
1 Kings 9:15 mentions Solomon building the Millo, identifying the location where Joash was assassinated.
In 2 Chronicles 25:27, a similar conspiracy kills King Amaziah, mirroring the pattern of royal assassination.
In 2 Chronicles 33:24, King Amon's servants conspire and kill him, another instance of a king slain by his own servants.