Whitney Houston fans have maligned Bobby Brown as a bad influence on his ex-wife. But the "My Prerogative" singer says he's not to blame for the late diva's death. "It's just unexplainable how one could, you know, [say that I] got her addicted to drugs," Brown tells Matt Lauer in a chat to air Wednesday on Today. "I'm not the reason she's gone." Brown, 43, says it was Houston who introduced him to hard drugs such as crack. Brown says he was devastated to hear Houston was still on drugs. "I was hurt. … because, you know, me being off of narcotics for the last seven years, I felt that she was, you know, I didn't know she was struggling with it still," he says. "But at the same time … It's a hard fight to, you know, maintain sobriety that way."