Jim Caldwell seems to be the heir apparent.
Source Rotoworld.com via PFT via League Source. CLASSIC!!!
Citing a league source, Profootballtalk.com reports Colts coach Tony Dungy will step down and be replaced by assistant head coach Jim Caldwell.
Dungy isn't expected to make his decision official before next Monday, but most close to the situation have expected him to retire. Caldwell is highly regarded in the Colts' locker room, especially by Peyton Manning.
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Direct quote from another forum.