Joanna Cassidy joins cast of "Body of Proof"

Joanna Cassidy (Boston Legal, Six Feet Under) has joined the cast of ABC's new fall drama Body of Proof, the network confirmed to TV Guide Magazine exclusively.

Cassidy will appear in the third episode and play the yet-to-be-named mother of Dana Delany's medical examiner, Dr. Megan Hunt.

"I get this weird chill when I write scenes for the two of them, it's a wonderful dynamic," creator Christopher Murphey tells TV Guide Magazine. "I think Megan and her mother have a wonderful back story that we will be basically mining over the first few episodes. You're going to be finding out a lot about Megan."

Body of Proof premieres Friday, Sept. 24 at 9/8c on ABC.