I'm really sorry about your friend, i know how hard it is.

About the wallet, maybe you could get the password from the web browser on his computer, as you know some people save their passwords on the web browsers (which is a damn terrible practice, but a lot of users do it), and maybe one of those passwords were used for the wallet too. That's what i would do, at least is a way to try to recover that wallet. I hope this information helps and i wish you good luck with the process.