Vulture reports that Short will fill in for Dave Foley as Marshall's new boss; Foley's new series 'How to Be a Gentleman' (also on CBS) prevents him from continuing his role.
Short got his drama fill on 'Damages' last season, and can next be seen on this season of 'Weeds,' which premiered last night.
In other TV casting news ...
• Ed Begley Jr. will play an assistant medical examiner on 'Rizzoli & Isles.'His episode of the TNT show, called 'Gone,' will air Sept. 5. [THR]
• 'Drop Dead Diva' is adding another guest star to its impressive roster.Bruce Davison will appear as a judge in an upcoming episode. [TV Guide]
• The newest 'Bachelor Pad' mystery man is ... Blake.The dentist got the boot from 'The Bachelorette' last night. [EW]