Dennis Day Documentary - Hollywood Walk of Fame

Dennis Day was an American singer, radio, television, and film personality, and comedian. He was of Irish descent.
Early life
Day was born and raised in the Throggs Neck section of The Bronx, New York City, the second of five children born to Irish immigrants Patrick McNulty and Mary McNulty. His father was a factory electric power engineer. Day graduated from the Cathedral Preparatory School and Seminary and attended Manhattan College in the Bronx, where he sang in the glee club.
In 1939, Gene McNulty, as Day was then known, sang on network radio with bandleader Larry Clinton. The Clinton broadcasts were aimed at the collegiate audience, and were often broadcast from a college campus. The 23-year-old McNulty won an audience poll as a favorite vocalist.

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Why the pictures of mouseketeer Dennis Day who is no relation?