UK's tallest man Neil Fingleton, who portrayed the giant 'Mag the Mighty' on HBO series 'Game of Thrones' and also appeared in X-Men, has reportedly died at the age of 36 following a heart failure on Saturday. The 7ft 7in star started off in basketball in USA before becoming an actor. He also took on roles in ‘X-Men: First Class’ and ‘Jupiter Ascending’.