ANSWER:

He’s still your non mahram as he was when he was married to your sister! 

You must not have any unnecessary interaction with him whether his wife is alive or dead. 

https://youtu.be/OvPMHo5SGZ0

After my sister’s death is my brother in law still related to me or we have no relationship. Do I have to be still formal with him or just casual acquaintance.

Dealings and Attitudes with Relatives, Women clothing | October 29, 2018 3:23 am
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I go to a school in a England and you are not allowed to wear the niqab in my college due to a ‘communication barrier’ however It’s a girls only school but there are some male teachers. I try to cover my face whenever i see a male teacher approaching however sometimes I don’t because I don’t see them on time or everyone stares at me and I’m shy to cover my face. Is this haram?
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I will be visiting my mothers country soon and the common clothes women wear is salwar kameez, which is loose trousers and a dress ending at the knees, is it permissible to wear this in front of non mahram men. I want to wear a loose abaya however my mother is strictly against this. No one wears an abaya there so I will also stand out