Hey, @yan
I am so sorry to hear about your loss. It's already a difficult situation, and dealing with account access issues only adds to it, and, trust me, I've been there more than once, myself. We're here to help to the best of our ability.
From my knowledge, the Atlassian Team may be able to help in this specific circumstance, so I'm flagging one of them down for you. It can take up to 3 business days for them to get back.
In the meantime:
There are multiple angles you can go. If the admin's email is a company-managed email, and someone has access to that company's email provider, you should certainly be able to access the inbox that way.
There are also some suggestions in this article.
Bear in mind this article was not written about your particular situation. It's just a place to find suggestions. The article says the account cannot be recovered, but your situation is different from the one the article is made for. I just included it in case it helps you find a very quick solution.
If you still can't get in, do not lose hope! Help is on the way. All of the best to you, and hoping the Atlassian Team is able to get you exactly what you need!
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