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Amidst their professional success, Costello faced substantial personal turmoil. In March 1943, he contracted rheumatic fever, forcing him to take a six-month hiatus from work. Tragically, upon returning to their radio show on November 4, 1943, he received devastating news: his son Lou Jr. had accidentally drowned in the family pool while his parents were unaware. The child was just two days shy of his first birthday. Despite this heartbreak, Costello insisted on continuing the broadcast, showcasing his resilience with the mantra, "The show must go on."
The audience remained unaware of the tragic loss until after the show ended, highlighting Costello's professionalism and dedication to his craft.