See Who Made Us' List of Stars Who Care

Nelly

"I wish I could have saved her," says Nelly, whose leukemia-stricken sister, Jackie Donahue, died in 2005, two years after they launched the Jes Us 4 Jackie campaign to encourage people to register for the National Marrow Donor Program. "But we've been able to find donors for 67 others," Nelly says.

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