While 'Mad Men' is on a lengthy hiatus, Christina Hendricks popped up on her husband Geoffrey Arend's show 'Body of Proof' (Tue., 10PM ET on ABC). She had two roles, playing identical twin sisters.

The forensic pathologist (Arend) shared with Karen what he discovered to be the cause of her twin's death: deep vein thrombosis. A blood clot stopped blood flowing to her heart.

"Our parents are dead. We're all each other had," said Karen, tearing up. "We were inseparable."

Dr. Gross offered her his handkerchief. "Would you like to go somewhere else to talk?"

Watch the full episode here: