The Brief Two years ago, Gaither football's offensive line coach, Greg Callahan, was diagnosed with a form of melanoma. Follow FOX 13 on YouTubeBig picture view:Unfortunately, Callahan’s voice is one that’s been increasingly absent at Gaither over the past few seasons. A GoFundMe has been created and raised nearly $7,000 to help the Cowboys' coach in his fight. The Source: The information in this story was gathered by FOX 13 Sports' Sean Barie. WATCH FOX 13 NEWS:STAY CONNECTED WITH FOX 13 TAMPA: