Tony Gwynn died at the age of 54 in 2014 after a 4-year battle with mouth cancer—specifically of the salivary gland on the right side of his face.

Head Coach and MLB Hall of Famer Tony Gwynn of the San Diego State Aztecs looks on from the dugout against the UC Davis Aggies during a game on April 3, 2009, at Petco Park in San Diego. Donald Miralle/Getty Images