Robin Windsor was in "excruciating pain" before his death, according to his friend and former dance partner Kristina Rihanoff.Taking to Instagram after news of his shock passing, Kristina penned an emotional tribute to Robin, sharing that he had still been struggling after sustaining an injury a number of years ago. Sharing a black-and-white snap of herself and Robin, Kristina wrote: "There is no words to express the pain and devastation.