Heyward is wearing the eye black to honor his father, former NFL fullback Craig "Ironhead" Heyward, who died in 2006 from cancer.
The writing on the eye black violates the NFL’s uniform policy, which states that players can’t display personal messages. Heyward was fined $5,787 last week and faces a penalty of $11,576 for his second violation.
Heyward will appeal the original fine on Tuesday, but it remains unclear whether he will be fined again. Even if he does receive the fine, he said he has no plans to stop wearing the eye black.
“I'm not going to shy away from the fight against cancer, and I'm going to support them in any way possible,” he said, according to ESPN.