Hello, my brother passed away last week. Yesterday I heard he had purchased bitcoin a long time ago. What do I need to do to be able to sell his bitcoin as part of his estate. I have no bitcoin wallet app from him. Dont know password. There is no will, although I can obtain an attorney who can legally appoint me as administrator of the estate. He lived in Miami, Florida. Thank you for any help
One thing you can do is to get the passwords from his web browser and try to open the wallet with those passwords. This is not a 100% working method, but if you have luck then he use the same password for some things.
Other thing to do is to take a look to his important files, some people store paper wallets in a printed sheet, if that's the case then you can import the wallet and take the btc.
Hope this tips helps
and i'm sorry for your brother always a family miss brings pain 
Web browser is a good idea as most of them have setting saved in their own computer browser so that they can easily login the wallet. Apart from that you can check his computer fully and some of his daily activity area also should be checked, as you can find some information of his work on crypto currency.