Yeah, that's really sad... I discovered his musics way back in the 80s in my late teens and have been a fan ever since. He was part of and arguably even the key member (because he usually composed much of the music) of so many bands, Art Blakey, Miles, Weather Report, etc. His own records, particularly, the 60s era Blue Note ones are some of my favorite jazz recordings in my collection. I'd say that he's about as important as Miles, Coltrane or anyone in the modern jazz realm... He will be missed.