The 76-year-old filmmaker's sibling died at the age of 68 in August 2012 when he committed suicide, leaving Ridley devastated, reported Variety.
However, the 'Alien' director is grateful that he had spent a lot of time with Tony before the tragedy occurred due to the 'Top Gun' creator's lengthy battle with brain cancer - something the family kept secret.
"Tony had been very unwell, actually, and that's the moment I realised I had to get very close to him again, though we were always close," he said.
Ridley ends his new film 'Exodus: Gods and Kings' - which is out in December - with a dedication to his younger brother Tony.