Maybe there’s finger pointing for some political ends ?
He was 77, anything can happen. Any surgery is a shock to the system.
A former boss had surgery at about the same age, all went well. He was basically in good shape for his age afterwards.
A few months later they wanted to go in again for something else “minor” and once the op was in progress his kidneys failed, then everything else. He died on the table.
Why didn’t they just give him a pain pill?