The final moments of a king's reign are often defined by how he is laid to rest and who steps in to lead. The burial of King Amon and the immediate transfer of power mark the official end of his rule. He was laid to rest in a grave that he had already managed to prepare and dig for himself during his lifetime [מצודת דוד].
The chosen location for his burial, the garden of Uzza, highlights a continuation of his family line, as this was the exact same place where his father, King Manasseh, had been buried before him [ביאור שטיינזלץ]. Once the burial was complete, his son Josiah took his place on the royal throne.