U.S Attorney Byung J. “BJay” Pak has announced that he is resigning effective immediately on Monday.

Pak has been the chief federal law enforcement officer for the Northern District of Georgia for three years. The district consists of 46 counties in northwest Georgia and has offices in Atlanta, Rome Gainesville and Newnan.

Pak was nominated as a U.S. Attorney by President Donald Trump in July 2017 and sworn in on October 10.

“It has been the greatest honor of my professional career to have been able to serve my fellow citizens as the U.S. Attorney for the Northern District of Georgia,” Pak said in a statement.

Pak cited “unforeseen circumstances” as the cause of his departure. Pak originally intended to stay with the office until Inauguration Day on Jan. 20, according to the Atlanta Journal-Constitution.

Pak was born in Seoul, South Korea and immigrated to the U.S. when he was nine years old. He lives with his family in Gwinnett County.

In addition to being a U.S. attorney, he served as a state representative in Georgia from 2011 to 2017.