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ASSOCIATED PRESS
This June 22, 2014 photo provided by ABC shows Barbara Walters, left, during an interview in Los Angeles with Peter Rodger, the father of Elliot Rodger, the 22 year old who killed six people, injured 13, before taking his own life near the campus of the University of California, on May 23, in Santa Barbara, Calif. The interview will air on a special edition of "20/20" airing Friday, June 27, at 10 pm ET. (AP Photo/ABC, Rick Rowell)
LOS ANGELES >>The father of the young man who killed six people and injured 13 others near the University of California, Santa Barbara, last month says it’s his "duty" to help prevent future mass killings.
In a letter provided to ABC on Friday, Peter Rodger says he wants to help people recognize warning signs of mental illness within families.
He says his son, Elliot, hid his sickness from his family, mental health professionals and law enforcement. The father says in hindsight he is beginning to understand there are traits that family members can look out for in loved ones.
Peter Rodger also spoke to Barbara Walters in an interview to air Friday as an ABC News prime-time special.
Elliot Rodger died of an apparently self-inflicted gunshot wound after the May 23 rampage.
