The London Evening Standard has named the man as Kevan Ward, a security supervisor in his 50s.
The father-of-two is thought to have been suffering from depression due to personal issues. He is said to have died at 6.45am on Wednesday, just 45 minutes after starting his shift.
This latest tragedy comes just days after the suicide of 29-year-old Rema Begum, who jumped to her death last week from the rooftop terrace at the popular Coq D'Argent restaurant near Bank station in London.
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