It is impossible for someone to write after their death. However, the adjective posthumous refers to an action, comment or honor (or publication of works) done after one's death.
Obituary.obituary
Fatal, tragic, mortal, terminal.
This type of story could be called a tragedy.
There is no one-word substitute in English for "son-in-law."
The word you want is florist.
Sportsmanship is a word substitute for spirit of game
The word metalworking is one word.
eat, use
The word that works is idiot.
what word can I substitute for constitutes
Elevate
Traditionalist