Just looked up the history of that album, and it was his last recording during 1978 when he was quite ill and looking to make some money pretty desperately:
"By the mid-1970s Green's health was in serious decline, in part from his long battle with drugs. His failure to become a big name in music, with the accompanying financial rewards, and a series of failed relationships, further demoralized him. Green married Karen Duson Wallace, a nurse, in 1974. By 1977 the marriage had failed. Dorothy Malone became his constant companion until his death.
Green recorded his last album, Easy, in April of 1978. That autumn he had a minor stroke that left him temporarily paralyzed on his left side. A blood clot was found near his heart and the doctors ordered triple-bypass surgery, but Green refused. Instead, he drove across the country for a gig in California. After the long drive back to New York, he suffered a heart attack and died on the way to Harlem Hospital on January 31, 1979. He was 43."
Grant Green Biography - Raised on the Blues, Succeeded and Crashed in New York City, Turned to Popular Music