Very sad. I played "Just The Two Of Us" and "Lovely Day" for years with a band back in the 90s.
I remember friends of mine excitedly listening to his album
Still Bill back at the end of '72. The track I always think back on from those days is the now less well-known "Use Me". As Lenny K says, "Rest in power, Bill".
https://www.youtube.com/watch?v=FTBHsuUdqoQAll the obits mention "Lovely Day" - I've never heard it. I remember "Use Me", "Lean on Me", "Kissing My Love", "Grandma's Hands", of course "Sunshine" and the song with Grover Washington, Jr.