Adrian Williams, 51, from Soham, was found on the ground in High Street, Newmarket, on 27 December and died in hospital on Tuesday.
Peter Crotty, 33, of Nimbus Way, Newmarket, was originally charged with causing grievous bodily harm, but has now been charged with murder.
He is due at Bury St Edmunds Magistrates' Court later.
A man has been charged with murder after the death of another man who was found on a pavement with head injuries.