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Actor Ryan Reynolds has written an emotional tribute after the 13-year-old boy who may have been the world’s biggest Deadpool fan lost his battle against cancer.

Reynolds met Connor McGrath through the Make-A-Wish Foundation.

Connor was 13. But this kid... He was smart. He was funny. And not just funny 'for a kid' - or funny 'for a person battling something awful'. He was unqualified funny. He had that... thing. That thing you see in great performers or comedy writers. A running commentary/observational skill people are just lucky to be born with.

Connor's wish was to see Reynolds’ movie. The actor made sure Connor was the first person to see the film, which would go on to make $760 million at the global box office.

It was the Make-A-Wish Foundation that brought us together. I can't thank them enough. Seriously. Thank you. Because of his wish, Connor was the first person to see Deadpool. I traveled up to Edmonton, Alberta to surprise him with a rough cut of the film. There were still huge sections with wires we hadn't yet painted out, jokes which weren't working (and still aren't) and green screens. Connor didn't seem to mind. And I'd never felt luckier to get to be Wade Wilson.

They exchanged countless text messages. When Reynolds visited Connor six weeks later, he realized things weren’t going well.

After my visit, I didn't know if I was saying goodbye or see ya later. Sitting here now, I realize it was both. I'm grateful I got to orbit Connor's world for a brief time. Grateful for the pages and pages of hilarious texts between us. Grateful to his parents for allowing Connor to spend time with a foul-mouthed child in the body of a 39 year old. I called Connor, "Bubba". And he called me "Bubba2". We met because he loved Deadpool. In a certain sense he WAS Deadpool. Or, at least everything Deadpool aspires to be; balancing pain, fearlessness, love and a filthy (filthy!) sense of humor in one body. I wish he could've stuck around a lot longer.

He thanked Connor’s family and Make-A-Wish for bringing the two of them together. And he also made a final promise to his friend.

“See ya down the road, Bubba.”