Maria Shriver (searchquit NBC News on Tuesday, saying it would be too tough to juggle a journalism job with her duties as first lady of California.

Shriver, a "Dateline NBC" (searchreporter, said she will continue to work on specials connected to her children's books for other NBC properties.

Shriver took an extended leave from NBC News when her husband, Arnold Schwarzenegger (search), ran for California governor. When he won, she returned to work, making two appearances as an anchor for "Dateline NBC."

But she said that it became clear to her that as first lady, her journalistic integrity would constantly be scrutinized.

"After much soul searching, I have asked to be relieved of my duties at NBC News," Shriver said in a statement.