2 Chronicles 24:25 describes the assassination of Joash by his officials, providing the backstory for Amaziah's execution of the murderers here.

2 Chronicles 24:26 names the conspirators Zabad and Jehozabad who killed Joash, identifying those Amaziah executed.

2 Kings 14:5-22 gives the parallel account of Amaziah executing his father's murderers and the rest of his reign.

2 Kings 14:3 gives the parallel account of Amaziah's reign, noting he did right but not like David, providing a fuller evaluation.