Citigroup’s Asian operations has lost a key piece of the puzzle, following the abrupt departure of Nikhil Eapen, the bank’s head of technology, media and telecommunications in its investment banking division.

Mr. Eapen is parting ways with Citigroup to take up work at Singapore-based Temasek and more specifically Singapore Technologies Telemedia Pte Ltd.

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The move is a surprise development that leaves Citigroup without its top investment banker in the Asia-Pacific (APAC) region. Citigroup has not revealed a succession candidate as of yet.