What happened to Chuck Oberstein?

I was a professional clown, and was painted by Chuck Oberstein on many occasions. We had an art gallery Clown Alley in Orange, CA.. we were forced to close our gallery in 1995. due to poor health..we lost contact with him at that time...I just found out that Mr. Oberstein passed away in 2004 and was shocked..does anyone know the cause of death, or where his wife Judy might be.......any help would be appreciated.....