The interview will air as an upcoming special edition of 20/20, the network announced Monday.
An ABC News rep told Variety that Rodger had specially requested Walters.
Rodger's 22-year-old son, Elliot, killed seven people, including himself, in a shooting and stabbing rampage in Isla Vista, Calif., on May 23. Elliot left behind a 140-page manifesto referring to his planned "Day of Retribution."
Notable deaths of 2014 [PHOTOS]