McGarahan, 45, suffered head injuries in the attack on Sunday and died at Addenbrooke’s Hospital in Cambridge the following day.
A spokesman for the bank said: “It is with deep regret that Barclays has learned of the death of Frank McGarahan, chief operating officer at Barclays Wealth. Frank was a valued member of the team at Barclays Wealth and he will be sadly missed by his colleagues.
“The thoughts of all at Barclays go out to Frank’s wife and family. The matter is now subject to police investigation.”