SHAFAQNA- Islamic laws on fasting according to the Fatwas of the Grand Ayatollah Sistani.
Laws of lapsed (Qadha) fasting if one dies before passing of a period of time in which he could have made it up
Ruling 1671: If someone does not fast in Ramadhan due to illness, Hayd, or Nifas, and he dies before the passing of a period of time in which he could have made up those fasts, then those fasts do not have to be made up.
The full text of the Islamic Laws according to the Fatwas of the Grand Ayatollah Sistani is available in English here:
https://www.sistani.org/english/book/48/
In French:
https://www.sistani.org/french/book/55/
In Spanish:
Las leyes prácticas del Islam (I), por Ayatullah Sayyid ‘Ali Husaini As-Sistani
[Video] Commentary of the Holy Quran 3:133