“The world mourns a genius today, and we grieve for the loss of our cousin, our friend, and our partner in a great musical adventure,” the Beach Boys wrote in a statement. “Brian Wilson wasn’t just the heart of the Beach Boys — he was the soul of our sound. The melodies he dreamed up and the emotions he poured into every note changed the course of music forever. His unparalleled talent and unique spirit created the soundtrack of so many lives around the globe, including our own. Together, we gave the world the American dream of optimism, joy, and a sense of freedom — music that made people feel good, made them believe in summer and endless possibilities.”, Beach Boys co-founder Brian Wilson’s cause of death has been revealed.. According to a death certificate obtained by TMZ, Wilson’s primary cause of death was respiratory arrest, with sepsis and cystitis also listed as contributing factors.The document notes several other health issues the 82-year-old musician was facing, including his neurodegenerative disorder, obstructive sleep apnea , Brian Wilson's cause of death has come to light, two weeks after the Beach Boys founding member died at 82. He also reportedly lived with multiple health issues before his death..