Harper Lee, the Pulitzer Prize-winning author of the novel “To Kill a Mockingbird” about racial injustice in the South, has died at the age of 89. Lee, who avoided the public spotlight, was the center of media attention last year when her publisher announced the release of “Go Set a Watchman,” an early version of “To Kill a Mockingbird,” which Lee’s attorney said she stumbled upon decades after it was written. Lee died in her sleep in her hometown of Monroeville, Alabama, which the town of Maycomb in “To Kill a Mockingbird” was modeled after. She was buried in a private ceremony.