Duncan, the son of former Cardinals pitching coach Dave Duncan, hit 22 homers as a rookie during St. Louis’ 2006 title run. He played three more years in the big leagues for the Cardinals, hitting 21 homers in 2007 and driving in a career-high 70 runs. Injuries limited him in the last few years of his career.
After baseball, Duncan became a popular radio personality in St. Louis on 101 ESPN.
The 37-year-old was first diagnosed with glioblastoma in 2012. His mother, Jeanine, also had the same disease at the time and died in 2013 at the age of 64.
Duncan took a temporary leave from the radio station in March, and according to the St. Louis Post-Dispatch explained on-air that “this tumor keeps popping up, so I’ve got to do something about it.”
The Cardinals issued a tweet Monday supporting Duncan.
— St. Louis Cardinals (@Cardinals) January 7, 2019
Duncan’s radio show “The Turn” tweeted an announcement that Duncan would be stepping away, saying, “If you pray, please keep him in your prayers. If you don’t, keep him in your thoughts. He is our brother and we miss him.”