If you dont have the pin, but instead a 12 or 24 word list, you can use that on many different wallets, of which one is Electrum. You can download it from
http://electrum.org/#downloadAlthough it is not clear here what OP have or not have, in case they can find 24 seed words, only correct way to accces that wallet is to enter wrong PIN three times in a row, and Nano S will be reseted to factory settings. All this is necessary only if the correct PIN can not be found. This is in this or that way connected to hardware wallet, so there is no need to make confusion with any other wallet.
In any case, the deceased person is probably make some backups, it may take time for something like that to be found.