Sheikh Khalifa bin Zayed Al Nahyan died at age of 73 on Friday, May 13. Conor McGregor has expressed his condolences regarding the passing of the president of the United Arab Emirates Sheikh Khalifa bin Zayed Al Nahyan. “I am mourning with the people of the UAE at the passing of Sheikh Khalifa bin Zayed,” McGregor tweeted Friday along with a photo of the later UAE ruler. “His legacy is historic.” Sheikh Khalifa presided over much of the UAE’s economic growth since succeeding his father as the country’s second president in November 2004. He bailed out the debt-ridden Dubai emirate…