Cf. Trésors du Nouveau Monde, fig. 212, Chefs d'Oeuvres Inédits, pl. 428 for two other extant examples. Les Mayas, pls. 550-551, for similar headdress.
The Diving God, Yum Kaax, is closely associated with agriculture and fertility, the Maya codices portray him with Maize imagery, see Codex Trocortesianus, pl. 35a (Museo de America), but he also appears as a sacrificial offering. The association of agriculture and fertility with death makes sense with the growth cycle of maize. To create a plant, one must burn the vegetation to clear a new field. Maize is also the epitome of new life, being both the material of human creation and the basic unit of the Maya diet.