Before lengthy surgery to remove the tumor, a video of Still’s giving Leah a pep talk went viral.

Pre-surgery pep talk...I might be nervous and scared beyond words but I'll never let her see it...let's get this done!

A video posted by Devon Still (@man_of_still75) on Sep 25, 2014 at 4:35am PDT

He also snapped photos of Leah as she recovered from her surgery and chemotherapy treatments.

A princess will be a princess regardless of her environment. \"No more hospital gowns!\" ???? S/O to mom mom missy for the princess gowns

A photo posted by Devon Still (@man_of_still75) on Feb 24, 2015 at 10:36am PST

The team also gave back by donating all proceeds from Still’s jersey to pediatric cancer research. The jersey was quickly the top-selling jersey in Bengals history and the team ended up donating over $1 million to cancer research.

After undergoing months of treatment, Leah was finally able to see her father play for the Bengals again in November. Wearing a protective mask to help stop infection, Leah joined Bengal team officials as they gave a $1 million check to the Cincinnati Children’s hospital. The girl did not stay on the field for long and had to be taken of the field by her grandmother.

\"PHOTO:
Andrew Weber/USA TODAY Sports/Reuters
PHOTO: Leah Still daughter of Cincinnati Bengals defensive tackle Devon Still stands on the field during the first quarter against the Cleveland Browns at Paul Brown Stadium, Nov. 6, 2014.
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The girl did get a special picture with the Bengal’s cheerleaders.

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In the past few months, Still has documented sweet moments with Leah as she received treatment and seemed to be on the road to recovery.Last month the girl was healthy enough for a special walk down the runway during New York’s Fashion Week. Devon Still gushed on Twitter that Leah was \"a natural.\" He, too, was wearing plaid and a vest, and said Leah was \"trying to match [his] style.\"

My little supermodel ??

A video posted by Devon Still (@man_of_still75) on Feb 12, 2015 at 4:42pm PST

Still shared happy news Tuesday that new scans show no sign of active disease. While more tests will be needed to confirm that Leah is in remission, Still posted a picture of himself and his daughter with the caption, \"that moment you get the best news you've ever received and don't know what to do so you just flex!\"

Leah will have a bone biopsy and MRI later this week.

That moment you get the best news you've ever received and don't know what to do so you just flex!! We got Leah's MIBG Scans back tonight and the doctors told us they didn't see any active disease in her body!!! We still have to wait for her MRI and bone biopsy results later this week. But the doctors feel very optimistic about them because of the results from today. So for now we celebrate!! #LeahStrong #PrayersWork #ThankYouEveryOne #ImSoHappyIFeelNumb #BeatCancer

A photo posted by Devon Still (@man_of_still75) on Mar 17, 2015 at 4:44pm PDT

ABC News' Sydney Lupkin contributed to this report.

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