Ryan Reynolds wrote a stirring tribute to perhaps the world's biggest Deadpool fan after the 13-year-old boy died of cancer on Tuesday.
Reynolds met Connor McGrath through the Make-A-Wish Foundation, which was able to help the teen become the first person to see the Deadpool film, which stars Reynolds.
"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," Reynolds wrote in the lengthy tribute to his young friend.
McGrath was hospitalized in Edmonton, Alberta.
Reynolds defended McGrath being allowed to see the R-rated film, which features over-the-top violence and raunchy language.
See photos of Ryan Reynolds through the years:
Ryan Reynolds through the years
Ryan Reynolds pens heartbreaking tribute after 13-year-old 'Deadpool' fan succumbs to cancer
CANADA - SEPTEMBER 08: David Arquette (centre) Kate Capshaw (l) Ryan Reynolds (Photo by Richard Lautens/Toronto Star via Getty Images)
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Ryan Reynolds during Battlefield Earth Premiere at Mann's Chinese Theater in Hollywood, California, United States. (Photo by Jeff Kravitz/FilmMagic, Inc)
400387 19: Actor Ryan Reynolds arrives at Maxims Super Bowl benefit for the HollyRod Foundation February 1, 2002 in New Orleans, LA. (Photo by Ronald Martinez/Getty Images)
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Ryan Reynolds during AMC & Movieline's Hollywood Life Magazine's Young Hollywood Awards 2003 at El Rey Theatre in Los Angeles, California, United States. (Photo by SGranitz/WireImage)
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Actor Ryan Reynolds arrives at The Ziegfeld Theatre for the premiere of "Definitely Maybe" Tuesday, Feb. 12, 2008, in New York. (AP Photo/Peter Kramer)
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Ryan Reynolds, recipient of the Male Star of the Year award, banters with photographers at the CinemaCon Big Screen Achievement Awards, Thursday, March 31, 2011, in Las Vegas. (AP Photo/Chris Pizzello)
FILE - This June 15, 2011 file photo shows actors Blake Lively, left, and Ryan Reynolds at the premiere of "Green Lantern" in Los Angeles. Reynolds wed Blake Lively in Mount Pleasant, S.C., Sunday, Sept. 9, 2012, at Boone Hall Plantation, according to a person familiar with the ceremony who requested anonymity because they were not authorized to speak on the matter. While it's Lively's first marriage, Reynolds was previously married to Scarlett Johansson. Their divorce was finalized last summer after three years of marriage. Lively and Reynolds both starred in last year's âGreen Lantern.â (AP Photo/Matt Sayles, file)
Ryan Reynolds attends the premiere of "Safe House", in New York, Tuesday, Feb. 7, 2012. (AP Photo/Charles Sykes)
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Actor Ryan Reynolds and his wife Blake Lively arrive for the screening of Captives at the 67th international film festival, Cannes, southern France, Friday, May 16, 2014. (AP Photo/Thibault Camus)
Actor Ryan Reynolds poses for a portrait for the film Captives at the 67th international film festival, Cannes, southern France, Saturday, May 17, 2014. (Photo by Joel Ryan/Invision/AP)
Actor Ryan Reynolds attends the "Mississippi Grind" cast party hosted by Chase Sapphire Preferred during the Sundance Film Festival on Saturday, Jan. 24, 2015 in Park City, Utah. (Photo by Evan Agostini/Invision for Chase Sapphire Preferred/AP Images)
Ryan Reynolds participates in AOL's BUILD Speaker Series to discuss his new film "Self/less" at AOL Studios on Monday, July 6, 2015, in New York. (Photo by Charles Sykes/Invision/AP)
Canadian actor Ryan Reynolds poses for a portrait in promotion of his upcoming role in the film "Woman in Gold" on Thursday, Feb. 26, 2015 in New York. (Photo by Victoria Will/Invision/AP)
"Before you jump down my throat for showing a 13 year old an R-Rated film, please know this kid knew more swear words than a British chef," Reynolds wrote.
McGrath loved the rough cut of the film Reynolds showed him and audiences loved the final version as the film went on to become one of the top grossing R-rated films of all time.
Reynolds stayed in touch with McGrath and even gave the boy his cell number so the two could exchange "pages and pages" of text messages.
"He went way too early and it's impossible to reconcile. Connor was a great friend, a great son, and a light to the people lucky enough to know him," Reynolds wrote. "I'm grateful I got to orbit Connor's world for a brief time."