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Elliot Rodger's dad to Barbara Walters: 'My son was a mass murderer'

Elliot RodgerBarbara WaltersIsla Vista Shooting

Peter Rodger, the father of Isla Vista gunman Elliot Rodger, told Barbara Walters in his first interview since the rampage that he didn't think his son could "hurt a flea" and that he has been living a "reverse nightmare" for the last month.

"Every night I go to sleep, I wake up and I think of those young men and young women that have died, and who were injured and were terrorized. And my son did that," Rodger said a clip released Thursday. "My son caused so much pain and suffering for so many families."

The interview will air at 10 p.m. Pacific on Friday during a special edition of "20/20." ABC News said Rodger sought out Walters for his first interview.

When asked by Walters about his life since his son killed six people and wounded more than a dozen others, Rodger said: "It's like a reverse nightmare situation."

"When you go to sleep normally you have a nightmare and you wake up and oh, everything is OK. No I go to sleep, I might have a nice dream, and then I wake up and slowly the truth of what happened dawns on me. And that is that my son was a mass murderer."

He continued: "There is no way I thought that this boy could hurt a flea .... we didn't see this coming at all."

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