Any apoptotic process in a keratinocyte. A keratinocyte is an epidermal cell which synthesizes keratin and undergoes a characteristic change as it moves upward from the basal layers of the epidermis to the cornified (horny) layer of the skin. [CL:0000312, GOC:jc, GOC:mtg_apoptosis, PMID:10201527]
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M5: Ontology GO: Gene Ontology GO:BP: GO Biological Process