Heitz was known for her brief but significant appearances onGleeas former glee club director Lillian Adler.
The actress made her film debut inDavid LynchsThe Straight Storyin 1999, opposite Richard Farnsworth andSissy Spacek.
She went on to appear on such series asThe Big Bang Theory,Greys Anatomy,ER, andShameless.
Credit: 20th Century Fox Television
She operated her own casting business before making the transition to acting.
In addition to her screen work, she appeared in productions at Chicagos revered Steppenwolf Theatre Company.
Heitzs husband of 37 years, Bill, died in 2002.
