Beloved Buffalo Bills fan Ezra Castro -- better known as "Pancho Billa" -- has died after a long battle with cancer ... his family announced Tuesday.
"Our hearts broken as we have lost our dear brother ezra "Pancho Billa" this morning," the family said in a statement.
"We are thankful and forever grateful for all the love and support during this journey. Ezra was surrounded by family and loved ones."
If you've ever seen a Bills game since 2008, you've probably noticed Pancho -- whose trademark sombrero and mask costume was a huge hit among Bills Mafia.