BODY OF PROOF - "Talking Heads" - When a severed hand and foot turn up in a back alley, Megan and her team must literally piece the victim back together. Meanwhile, Megan's daughter, Lacey, gets her mother's reluctant permission to visit her at the office and film her at work as part of a video essay for Social Studies class. What Lacey learns in the process profoundly changes her view of her mother, on "Body of Proof," TUESDAY, APRIL 12 (10:01-11:00 p.m., ET) on the ABC Television Network. (ABC/CLAIRE FOLGER) DANA DELANY