Very sad news. I saw him just over 10 years ago as part of Charles Tolliver’s Big Band and he looked in good shape at that time. He was doubling on both baritone and tuba. Yes, his work on Mobley’s ‘Slice’ album was great, as was his work with Gil Evans - RIP.
First albums I heard with him I think were Shepp’s ‘Mama Too Tight’ and the Evans Hendrix tribute.