Former Pittsburgh Steelers running back DeAngelo Williams is still dedicated to fighting breast cancer.

The star running back, who played college football at the University of Memphis, started covering the cost of mammogram screening for women in 2015 through his nonprofit organization, The DeAngelo Williams Foundation.

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Since then, the foundation has covered the cost of over 500 mammograms at hospitals located in Pittsburgh, Pennsylvania; Memphis, Tennessee; Jonesboro, Arkansas; and Charlotte, North Carolina.

Williams is a staunch supporter of breast cancer awareness. In 2014, his mother Sandra Hill died from breast cancer when she was just 53 years old. Williams also lost his four aunts to the disease, all before the age of 50.

This is dedicated to my mom, my aunts & women everywhere affected by Breast Cancer. I love you. #WeAreInThisTogetherhttps://t.co/bAwaanlfzV — DeAngelo Williams (@DeAngeloRB) October 11, 2015

Williams began sponsoring the free mammogram screening in honor of his mother through the "53 Strong for Sandra" program. At each event, the foundation sponsors mammograms for 53 women. The foundation eventually hopes to host a free mammogram screening event in every state.

"To be able to help all these women is amazing. This can be life-changing for these women," Williams said in a statement to TODAY recently. "We are enabling them to get this care that no one should ever be denied or not have access to."

"DeAngelo wants to ensure that no woman (or man) fights breast cancer alone," Risalyn Williams, his wife and executive director of The DeAngelo Williams Foundation, told TODAY via email.

Williams was key in leading a push in 2009 to allow NFL players to wear pink cleats throughout October, Breast Cancer Awareness month. At the time football fans were treated to fields of pink — pink headphones, pink cleats and pink pom poms — during October breast cancer awareness month. In 2015, Williams asked the NFL to allow him to wear pink on his uniform all year, but the league declined.

In recent years, the NFL's partnership with the American Cancer Society has broadened its focus to prevention and early detection of several cancers, including breast cancer, with the "Crucial Catch" program.