John Mara, the longtime owner of the New York Giants, just announced he was diagnosed with cancer ... while vowing to fight like hell and beat the disease.
70-year-old Mara, who also serves as president and CEO of the organization, did not specify which form of cancer he's battling.
"I have recently been diagnosed with cancer and have been following the treatment plan recommended by an outstanding team of doctors," Mara said in a statement released by Big Blue.
"I'm feeling strong and optimistic, and I'm committed to seeing this through to a positive outcome.