Al Fatihah to Mikaeel.
Surah 39, Ayah 42 “It is Allah that takes the soul (of men) at death; And those that die not (He takes) during their sleep: those on whom He has passed the decree of death, He keeps back (from returning to life), but the rest He sends (to their bodies) for a term appointed. Verily in this are signs for those who reflect”
I have no idea whether he will be buried as a Muslim or not. If it is, He will be doing a great da’wah by reminding people of the world that no one will escape from death and there is Hereafter worth to ponder.
All the best my brother.