Tony Gwynn
San Diego Padres legend and Pro Baseball Hall of Famer Tony Gwynn died on Monday at age 54. Reuters

San Diego Padres legend and baseball Hall of Famer Tony Gwynn died on Monday at the age of 54.

John Boggs, Gwynn’s longtime agent, confirmed the news to reporter Barry Bloom. The exact circumstances of Gwynn’s death are not yet known but he was diagnosed with a cancerous salivary gland in 2010.

The baseball legend underwent two surgeries, one of which was to remove a cancerous tumor from inside his right cheek, according to a recent profile by CSN Philly. Gwynn had been on medical leave from his job as baseball coach at San Diego State University since March while he recovered from his most recent cancer treatment, ESPN reports.

Known as “Mr. Padre,” Gwynn spent his entire 20-year MLB career in San Diego, setting franchise records in batting average, hits, runs, runs batted in, and various other categories. A 15-time All-Star, Gwynn also won seven Silver Slugger awards and five Gold Glove awards.

Gwynn was inducted to the Pro Baseball Hall of Fame in 2007.