She's a prospecting necrophiliac rabbi prostitue!
I just started watching Deadwood and recognized the lady who played Alma Garrett, but couldn't figure out from where, so I checked here on IMDb. Besides Deadwood, I've seen 3 things with her in it...
In one she plays a necrophiliac (Kissed)
In another she plays a rabbi (Six Feet Under)
In the other, she plays a prostitute (who's also a drummer in a band) (The Center of the World)
I guess this is what actors call "range"? She really was believable in all 4 roles despite that vast differences in the characters.