Updated

In a stunning reversal, Hong Kong's highest court has overturned the murder conviction of Nancy Kissel, the American expatriate accused of drugging and clubbing her banker husband to death.

Hong Kong's Court of Final Appeal also ordered a retrial in its decision issued Thursday. The court, however, ordered Kissel kept in custody pending a bail application.

Kissel's lawyers argued during the appeal hearing that prosecutors broke the law by using evidence during the murder trial that drew from the American's initial bail hearing after she was charged.

The mother of two, who lost her first appeal, has been serving a life sentence since she was convicted in September 2005.