Cardinals pitching coach Dave Duncan is taking a leave of absence due to family matters, reports Ken Rosenthal of FOX Sports. Duncan's wife has been battling cancer and had surgery to remove a brain tumor in August. Joe Strauss of The St. Louis Post-Dispatch says the team will issue an announcement tomorrow (Twitter links).
“As far as how long he’ll be gone, no one knows,” said GM John Mozeliak to Rosenthal.
Duncan, 66, has been the team's pitching coach since 1995, and he is widely considered to be one of the very best in the game. He was in the second year of a two-year deal signed last offseason. Bullpen coach Derek Lilliquist has filled in for Duncan in the past, though it's unclear if he will do so again.