Haʼ Kʼin Xook's reign ended with either his death or his abdication in favor of his brother Kʼinich Yat Ahk II; archaeologists and Mayanists have not arrived at a clear consensus.

In addition, a stone seat known as Throne 1 and erected by Kʼinich Yat Ahk II records either the death or abdication of Haʼ Kʼin Xook.

[5] The Mayanist Tatiana Proskouriakoff had initially overlooked Haʼ Kʼin Xook's reign, as she mistakenly assigned the title Ruler 6 to a sajal (or lesser Maya leader) of La Mar, based on a misreading of Stela 16.

[7] James L. Fitzsimmons argues that, politically, Haʼ Kʼin Xook was a weak leader, who like Yoʼnal Ahk III before him erected only a handful of monuments and did not enforce his power beyond the existing Piedras Negras hegemony.

[8] According to the stone monuments that he did raise, Haʼ Kʼin Xook's reign was comparatively quiet, as the only notable event recorded was the burial of a contemporary sajal at San Ignacio, Belize (El Cayo).

[6] In the night (of March 24, 780 9.17.9.5.11) Haʼ Kʼin Xok, Ruler 6, Lord of Piedras Negras abandoned the Lordship of Paw Stone place.

"[10] However, yaktaaj ajawlel is the same wording found on a monument, Zoomorph G, at Quiriguá, Guatemala, which details the death of the ajaw Kʼakʼ Tiliw Chan Yopaat in AD 785.

[12] Regardless, Kʼinich Yat Ahk II took up the throne on May 31, 781 AD (9.17.10.9.4 1 Kʼan 7 Yaxkʼin), almost a year after Haʼ Kʼin Xook's reign officially ended.

[16] Divination—a motif that had been introduced in the iconography of Piedras Negras by Kʼinich Yoʼnal Ahk II—is shown via the act of Haʼ Kʼin Xook dispersing the incense.