Summary: On the air, Dave Roberts was a smooth if straight-ahead Bay Area radio disc jockey hosting the afternoon drive for KYA and K101. Off the air he was “Dr. Dave,” armed with a doctorate in communications research and a knack for launching and driving radio formats. Roberts died Saturday at his home in Rochester, Mich., from the complications of prostate cancer, said his wife, Marsha Kelliher. He was 70.
