Noah Wilson, whose fight against cancer and devotion to the Royals was chronicled during last year's World Series, passed away on Tuesday at the age of 7.
The Olathe, Kan., native had his last radiation treatment in mid-June and had been considered free of Ewing's sarcoma, a bone cancer. However, his family learned in recent days that he had leukemia.
A family friend started a campaign to get Wilson to a World Series game after he'd watched the Royals' run through the 2014 playoffs from his hospital bed. After Major League Baseball heard about Wilson, it sent a box of memorabilia to his home and invited him and his entire family to a World Series game. They also attended a World Series Gala and met several players.
Eric Hosmer, Wilson's favorite player, posted a tweet after getting the news of his passing.
The Royals also expressed their grief when finding out.
While hospitalized last year, Noah started a campaign to make colorful Band-Aids available to children at Children's Mercy Hospital. It collected more than $7,000 and thousands of boxes of bandages.
Quinn Roberts is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.