Billy Dee Williams (Toussaint, GH: Night Shift) has been cast on ABC's Private Practice.  According to TV Guide, Billy Dee will have a guest role as the husband of one of Sam's (Taye Diggs)  patients.

In what is being described by setsiders as "a very moving role," Williams will play a patient of Taye Diggs' Dr. Sam Bennett. The storyline: BDW has been dutifully caring for his lady as she sings the blues (his wife is addled by dementia-type symptoms), yet he has been doing so with selfless disregard for his own declining health.

Thanks to Megan for the tip.