Dr. Arnold Klein died on Thursday night in Palm Springs, California at the age of 70.
Klein was one of Jackson's closest friends, and it was rumored that he was the biological father of Jackson's 18-year-old son, Prince. The doctor fueled some speculation when he tweeted a photo of himself as a young man alongside an image of Prince in January 2013.
News of Klein's death comes just one day after Prince was defending himself against a Twitter user who was claiming he was not the biological son of Jackson. "Everyone knows you are a Rowe-Klein NOT A Jackson!!" the Twitter user wrote. "Y'all should stop trying to put on a FAKE front and get real."
Prince responded, "The blood of the covenant is thicker than the water of the womb. I was raised by my dad with my brother and sister."