Every bill gets paid through a financial source and that is what you need to know and access. If RR got paper statements, it might be found in his files. If not, it would be found on his computer. Cash flow is your immediate concern..IRA's and investments come after. If he's used a money app, its most likely to be a single spot to keep track of all assets. . Another place you might look are his last year's or prior income tax files, the 1099's will provide the source of any interest or dividends received. The key to access any of these will be needing his password/s so that will be important. Hopefully, he kept a record of them somewhere if you don't know them. If you can't find or access the information, it will require at least a phone conversation to get forms that need to be filled out as wife and/or beneficiary and most likely a copy of the death certificate.