No details of his death were immediately available.
"Danny was a huge force in our early years. His love for the Blues led him to being asked to join Fleetwood Mac in 1968, where he made his musical home for many years.
"Danny's true legacy, in my mind, will forever live on in the music he wrote and played so beautifully as a part of the foundation of Fleetwood Mac, that has now endured for over fifty years," Fleetwood wrote on the social networking site.
His work featured in albums such as 'Then Play On', 'Blues Jam at Chess', 'Kiln House',?'Future Games?' and 'Bare Trees'.
Kirwan was fired from the band in 1972, reportedly due to alcoholism and the sour interpersonal relationships within the group.
He remained active briefly, recording unsuccessful three solo albums for the British label DJM in between 1975 and 79. His recording career ended at that point. His alcoholism and struggles with mental health left him homeless for several years.
Divorced, Kirwan is survived by a son.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)