Four months on the job, and one of Sands China’s key executives has already called it quits.

Last week, South China Morning Post reported that Stephen Law Cheuk-kin resigned from his position as chief financial officer of the Macau casino operator. A spokeswoman for the Hong Kong Stock Exchange-listed Sands China confirmed the news, telling the news outlet that Law stepped down “in January 2017.”

The casino operator declined to reveal the reasons behind Law’s resignation, saying that it “does not comment on the movement of personnel.”

Law, 53, previously worked as finance director of Hong Kong’s MTR Corporation but decided not to renew his contract and instead jumped ship to Sands China in September 2016. During his tenure at MTR Corp, Law has been noted for playing a key role in the Express Rail Link project between Hong Kong, Shenzhen and Guangzhou.