NFL reporter's 2-year-old daughter dies after leukemia battle

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New England Patriots beat reporter Doug Kyed announced that his 2-year-old daughter, Hallie, died Sunday after a battle with leukemia.

Kyed said Hallie battled for nine months and had a successful transplant in October, but she "relapsed" last week after a bone marrow transplant.

The Boston Herald writer said Hallie's chemotherapy was "ineffective" and "her aggressive form of leukemia had grown out of control by the time she started a trial treatment."

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Doug Kyed is a New England Patriots beat reporter for the Boston Herald. (Erica Denhoff/Icon Sportswire via Getty Images)

Kyed said he and his wife, Jen, held their daughter's hand in bed while she died in her sleep.

"We’re completely lost and heartbroken without Hallie. Our lives will never be the same. Hallie was a special kid, and she made a positive impact on so many people she met. We were lucky to be her parents, and [older daughter] Olivia was fortunate to have the best baby sister," Kyed wrote in an Instagram post that included family photos with Hallie.

"The world is a worse place without Hallie in it," he continued. "If you can take anything from Hallie today, it’s to know exactly what you want and to be persistent in asking for it, whether it’s going on a walk, ride in the car or wearing one particular Disney dress (usually Cruella). I’ll miss rubbing her hair and kissing her head and telling her I love her the most."

Gillette Stadium (Rich Graessle/Icon Sportswire via Getty Images)

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Kyed said doctors did "everything they could"