Harper Lee, the influential author of "To Kill a Mockingbird," has died at age 89. 

Lee, who won the 1961 Pulitzer Prize for fiction for "Mockingbird," published just two novels in her lifetime. She released “Go Set a Watchman” last summer, more than 50 years after “To Kill a Mockingbird."

Lee, who never married, did her best to stay out of the spotlight, turning down interview requests and leading a very private life in her hometown of Monroeville, Alabama.

Aside from receiving the Presidential Medal of Freedom at the White House in 2007, little was known about her later years.

(Read more on Lee's life at FoxNews.com.)

President George W. Bush and the former First Lady, Laura Bush, issued the following statement.

The Wall Street Journal gathered up some interesting numbers about Lee's career, including that she was paid a $1,000 advance - plus 15% royalties - for "To Kill a Mockingbird" in 1959.

See more tributes below...