Ebert co-hosted "Sneak Previews" with Gene Siskel in 1975. It was the first TV show offering film reviews. He was then joined by Richard Roeper, and the show became "At the Movies with Ebert and Roper."
He had a trademark on the thumbs up thumbs down feature.
Just two days ago, he posted his final blog, writing that it was time to slow down and that he was taking a "leave of presence" after writing 306 movie reviews in 2012, the most in his career.
He was considered one of the most influential film critics ever.
The Chicago-Sun Times first reported Ebert's death Thursday afternoon.
—By CNBC's Julia Boorstin; Follow her on Twitter: