Sorry for your loss. Take all the time you need, don't worry about the update right now. But you say it was today? it feels so sudden, I don't now what else to say :(
I'm sorry to hear that. If you feel like you need it, postpone the release until you feel better, everyone will understand it. Didn't know Mayer, but the music in Project Lyre so far was beautiful. If it was all Mayer's doing, it's not going to be easy to find a match for it.