1 particular plot with Sheldon and Mary in Young Sheldon season 7 may have likely caused George’s unexpected death. The Young Sheldon finale wrapped up with Sheldon’s move to California for his post-graduate studies at Caltech, per The Big Bang Theory‘s official canon. However, before the boy genius wrapped up his childhood in Texas, it was preceded by a tragedy with the death of his dad. While the incident was long-established in The Big Bang Theory, details about it were unclear, including how exactly he met his end. Young Sheldon answered that question, but it also posed a new mystery.

https://screenrant.com/young-sheldon-george-death-sheldon-mary-germany-trip-reason-explainer/