June 12 (UPI) -- Thai Princess Bajrakitiyabha, the eldest child of King Vajiralongkorn, died in a Bangkok hospital, the royal family announced Friday. She had been in a coma for more than three years since being taken ill with a heart condition. The Royal Household Bureau said in a statement that Bajrakitiyabha, 47, died on Thursday evening local time despite the very best efforts of medics at Chulalongkorn Hospital in the capital where she had been a patient since collapsing while out walking