On Tuesday, the Nanyang Technological University graduate pleaded guilty in court and was fined $6,500 on each of 20 charges under the Computer Misuse Act. Her total fine amounted to $130,000.

Some 168 other counts were taken into consideration.

Koh, 29, was one of seven Citibank officers implicated in these offences. Three of them, including a Citibank vice-president, were fined between $40,000 and $173,000, one was let off with a warning, while two others are due to be dealt with within a week.

As a relationship manager at Citibank's Orchard Road Branch, Koh had access to customer details stored in the bank's database.

She e-mailed existing spreadsheets of sensitive customer details to her personal e-mail account.

She also extracted additional data from the bank's Universal Work Station System and subsequently e-mailed them to her personal account.

The offences took place over a week from June 30, 2006, at a time when she was contemplating leaving Citibank and had already accepted an offer to join UBS, where her job scope would have been similar to what she was doing at Citibank.

Separately, on two days in May 2006, Koh received two e-mail messages containing one file she was not authorised to obtain from her supervisor Jonathan Seah.

This file contained spreadsheets that had data on the investable assets of 'almost each and every customer across branches throughout the entire Citigold platform', said DPP James Lee.

Read the full story in Wednesday's edition of The Straits Times.