Long John Baldry's partner for over 25 years was Felix "Oz" Rexach, a native of New York City. They met shortly after Baldry's brief relationship with lead guitarist of the Kinks, Dave Davies. The couple stayed together until Baldry's death on July 21, 2005. This information is supported by various sources including articles on Ultimate Pop Culture Wiki, the official Wikipedia page for Long John Baldry, and GayCultureLand. For more detailed information, you can refer to the Wikipedia page.