Sayyidina Abu Hurayrah (RA) reported that Allah’s Messenger (SAW) said, “Martyrs are of five kinds : He who dies of plague is a martyr, he who dies of stomach-ache is a martyr, he who dies trapped in falling wall or the like is a martyr, he who is killed in Allah’s path is a martyr.’
[Ahmed10293, Bukhari 653, Muslim 19141