Any apoptotic process in an endothelial cell. An endothelial cell comprises the outermost layer or lining of anatomical structures and can be squamous or cuboidal. [ http://purl.obolibrary.org/obo/CL_0000115 GOC:mtg_apoptosis GOC:mah GOC:BHF ]
Synonyms: programmed cell death of endothelial cells by apoptosis killing of endothelial cells apoptosis of endothelial cells programmed cell death, endothelial cells endothelial cell programmed cell death by apoptosis