Dave Duncan taking leave from Cards

St. Louis Cardinals pitching coach Dave Duncan is taking a leave of absence from the team for family reasons, general manager John Mozeliak said Thursday night. Mozeliak said no timetable has been determined for Duncan's return.

Duncan's wife, Jeanine, has been battling brain cancer, and he previously took a leave from the club after she underwent surgery in August to have a tumor removed.

In Duncan's absence, Derek Lilliquist will move from bench coach to pitching coach and Dyer Miller will be bullpen coach. Miller has worked previously as the organization's minor league pitching coordinator.

Duncan has been the Cardinals' pitching coach under former manager Tony La Russa since 1995. He worked from 1982 through 1994 as pitching coach with the Seattle Mariners, Chicago White Sox and Oakland A's.

The St. Louis Post-Dispatch reported that Duncan plans to remain with the Cardinals in another, as-yet-unspecified capacity.

Duncan is under contract for next season and the Cardinals announced in mid-November he'd be back, this time working under rookie manager Mike Matheny.

Jerry Crasnick is a senior writer for ESPN.com. Information from The Associated Press contributed to this report.