http://insidetv.ew.com/2014/08/26/night-court-alum-cast-as-lindsays-mom-on-chicago-p-d/

The “Night Court” alum will play Erin Lindsay’s mom in a multi-episode arc.
Read more at http://www.hitfix.com/tv-tattle#KuqWTPEXHxhr1hKp.99