Abu Hurairah (May Allah be pleased with him) reported:
The Messenger of Allah (ﷺ) said, "The martyrs are of five kinds: One who dies of plague; one who dies of disease of his belly; the drowned; one who dies under the debris (of construction, etc.), and one who dies while fighting in the way of Allah."[Al-Bukhari and Muslim].
App reference: Book 12, Hadith 69
Arabic/English book reference: Book 12, Hadith 1353