Per 105.1:
Detroit Sports 1051 @DSports1051 5m
Sources telling our @TomMazawey that Leyland informed team of his decision to retire on the flight home from Boston.
Fox Sports' Ken Rosenthal:
Sources: Leyland stepping down as #Tigers manager. Told team after end of ALCS. Team has called news conference for 11:30 AM ET.
Happy trails, Skipper.