Whoever sincerely asks Allah, the Almighty, for martyrdom, Allah will raise him to the status of martyrs even if he dies on his bed. [Sahih/Authentic] - [Muslim

"«مَن سَأَل الله تَعَالى الشَّهَادَة بِصِدق بَلَّغَه مَنَازِل الشُّهَدَاء وإِن مَات عَلَى فِرَاشِه». [صحيح.] - [رواه مسلم.]"