He died on "Feb. 1648-9" see Dictionary of National Biography, Errata (1904), p. 1 in
Grosart 1885, p. 23. This means he died 3 days after the execution of Charles I, which is usually recorded as having happened on 30 January 1649 not 1648 because at that time the new year was 25 March not 1 January (for a more detailed explanation see Old Style and New Style dates). Grosart, Alexander Balloch (1885). "Abbot, George (1603-1648)" . In Stephen, Leslie (ed.). Dictionary of National Biography. Vol. 1. London: Smith, Elder & Co. pp. 20–21.