Lacey "Princess" Holsworth, the 8-year-old whose battle with cancer led to an unlikely friendship with Michigan State basketball star Adreian Payne, has died.

Beloved by Michigan State players, fans and college sports media alike, Lacey was the inspirational figurehead of the team's March Madness run. She suffered from a rare form of nerve cancer. A fan-launched crowdfunding campaign has raised more than $70,000 for her treatment.

Early Wednesday morning, the Holsworth family posted this photo on Instagram, with a message that read: "Princess Lacey has achieved the ultimate victory. She now dances among angels.... The world is a better place because you were in it. Our hearts are broken. We love you Doll. Dance all night..."

The NCAA shared its condolences on Twitter:

We are saddened by the passing of @adorablelacey, who warmed our hearts this past basketball season. pic.twitter.com/02KtGegRjk

— NCAA March Madness (@marchmadness) April 9, 2014

Payne met Lacey two years ago when the Spartans visited a hospital, and their friendship continued on and off the court as they kept in touch via text message and social media. The 8-year-old and her family called Payne a "brother" and "Superman."

Lacey accompanied Payne onto the court at Michigan State's Senior Night this season, and she helped him cut down the net when the Spartans won the Big Ten Conference tournament.

Michigan State's NCAA tournament run ended with a 60-54 loss in the Elite Eight to UConn, the eventual national champion. Payne is a sure bet to enter the NBA next season.

Sam Laird contributed to this report.