Judith McHale, undersecretary of state for public diplomacy and public affairs, is expected to announce as early as Tuesday that she will be leaving her post in June to return to the private sector in New York, sources said.

For the past two years, McHale, former general counsel and then president and chief executive of Discovery Communications, has overseen hundreds of employees in the department’s international information programs, in the educational and cultural affairs bureau, and in the public affairs operation at State, as well as in embassies overseas.

In 2006, after nearly 20 years at Discovery, McHale started a new phase of her career in partnership with the Global Environment Fund, a private equity firm based in Chevy Chase.

No word yet on a replacement.