Meanwhile, Moonves has said repeatedly that it continues to be a major priority at CBS to modernize and customize the news to suit current audiences.
"I believe Sean's background has prepared him well for the significant tasks that face us at CBS News, and I am very pleased that we have such a brilliant executive within our management team who can take on this crucial role," said Moonves, in a statement.
"The business is changing and the challenges are many. I'm confident that, while maintaining the standards and values of this great organization, we can build upon its legacy and become even more successful, competitive and relevant to the viewers and the nation we serve," said McManus.
Of Heyward, who served the company for more than two decades, Moonves said, "Andrew is a man of great character, whose integrity and experience has guided our News division through a time of tremendous change in our industry," said Moonves. "I want to thank him for his unwavering commitment to the core values of journalism, and for his years of creativity, dedication and loyalty to this company. I wish him only the best and look forward with anticipation to what I'm sure will be an important next phase in an already-distinguished career."