Listening to Zappa's Burnt Weeny Sandwich LP, I recall the terrific violin playing of Don Sugarcane Harris, who was featured on the LP.
Searching the Internet for information about Harris, I discovered that the wikipedia article on him gives his date of death as both November 27, 1999 and November 30, 1999. The footnote verifying his DOD is a link to Harris' New York Times obit which states that Harris was found dead on Dec.1 in his Los Angeles apartment by his landlord. His independent.co.uk obit gives the DOD as Dec.1st.
Evidently, the exact date isn't known, due to his having been found dead some time after the fact.