4
A petition is automatically void when the petitioner dies. There are some very limited exceptions. One is if you (the beneficiary) were residing in the US at the time the petitioner died, and continues to reside in the US now, you can seek INA 204(l) reinstatement. There is also humanitarian reinstatement for if you have some very special humanitarian reason....
3
Was this denial of entry legal?
Probably not. Type D visas are automatically valid for short visits (subject to the 90/180 rule) to other Schengen countries, regardless of the "valid for" entry, perhaps unless there is an explicit annotation restricting short visits. (I'm not sure about the explicit annotations, more specifically how it works ...
1
You don't have to do anything and your title remains valid unless the préfecture moves to invalidate it, which they are presumably entitled to do, as you probably do not fulfill the conditions anymore (e.g. you left your job or stopped your studies). As far as I know, they are happy to wait for the renewal or do a yearly sweep and are not super aggressive in ...
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