Greg Papa sounded like Greg Papa.
During a recent two-hour phone interview from his North Bay home, the San Francisco 49ers radio announcer’s distinctive baritone was robust. He recalled dates and details with his usual precision and punctuated stories with trademark humor.
But every three seconds, there was a loud click.
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It came from a machine delivering supplemental oxygen through a nasal cannula. At one point, Papa paused to make the short walk to the bathroom. When he returned, he was winded…