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With little warning Wednesday, longtime STL broadcaster Don Marsh quit his job as host of St. Louis Public Radio's "St. Louis on the Air."

The one-hour talk show airs on KWMU (90.7 FM), weekdays from noon to 1 p.m.

Marsh, who declined to comment on his departure, began hosting the one-hour interview show in 2005.

Madalyn Painter, marketing and digital media director at the station, said Marsh resigned before he was to go on air for the Wednesday show. The resignation was effective immediately, she said.

Alex Heuer, the show's producer, and political reporter Jason Rosenbaum have filled in since Marsh's departure. A search has begun to find a permanent replacement, Painter said.

Painter declined further comment, saying it was a personnel matter.