KUALA LUMPUR, May 7 -- What started as a routine attendance for Datin Seri Pamela Ling Yueh as a witness assisting the Malaysian Anti-Corruption Commission (MACC) has now turned into a full-blown police investigation following her abrupt disappearance last month.

Missing since April 9, 42-year-old Ling had failed to appear at the MACC headquarters in Putrajaya, prompting her lawyers to file a police report the same day.

With authorities being tight-lipped about the case, here's a primer on what we know so far:

Ling's background

According to Ling's lawyer Datuk N Sivananthan, Ling and her husband (later identified as Datuk Seri Hah Tiing Siu) were undergoing a contentious divorce in both Singapore and Malaysia, involving a substantial ...