"I’m still trying to find where they were buried."
You seem to know when they died and in which city?
In that case you need to find out where the local "Register of Burials" for that area and that time period are kept.
It is likely that they will be in the local archives which are often held in the main library in that area. Local archives often have an online catalogue so that you can see if they have the documents you're looking for. Alternatively, you can just give them a call or pop in to see them.
You will probably need to make an appointment to go and actually view them though, as the archivist will need to get them out from wherever they are stored.
If you have a rough idea of the date of death then that will save you a lot of time looking through the Register as you can just go to the relevant time period.
The burial register will typically give you the name, age, occupation, date of death, place where death occurred, place of burial, date of burial and person who performed the burial ceremony.
But typically you have to do this old school and actually go to the archives and look at the actual document in real life rather than doing it online.
Also, the archives may also hold copies of local newspapers. If you search the local newspapers around the date of burial then you may well find obituaries there.