Alex, "For Green as for Brooks, the suppression of income and reputation brought on spiraling misfortunes and reduced him to beggary." This is according to Jack Chambers's WHO KILLED TINA BROOKS?
Many of Grant's recordings were not released during his lifetime. These include McCoy Tyner and Elvin Jones (also part of the Solid group) performing on Matador (also recorded in 1964), and several albums with pianist Sonny Clark. In 1966 Grant left Blue Note and recorded for several other labels, including Verve. From 1967 to 1969 Grant was, for the most part, inactive due to personal problems and the effects of heroin addiction. In 1969 Grant returned with a new funk-influenced band. His recordings from this period include the commercially successful Green is Beautiful and the soundtrack to the film The Final Comedown.
Grant spent much of 1978 in hospital and, against the advice of doctors, went back on the road to earn some money. While in New York to play an engagement at George Benson's Breezin' Lounge, Grant collapsed in his car of a heart attack in New York City on January 31, 1979. He was buried in Greenwood Cemetery in his hometown of St. Louis, Missouri, and was survived by six children. Since Green's demise, his reputation has grown and many compilations of both his earlier (post-bop/straight ahead and soul jazz) and later (funkier/dancefloor jazz) periods, exist.
Enjoy the music.