Portia

Zoe thinks she's seen a ghost. Plus, her mother comes to town in hopes of reconciling with Zoe, and Lavon won't authorize Lemon and George's dream home purchase.

Liz deals with the difficulties of her long-distance relationship while trying to find Tracy; Jack's impending wedding brings his mother (Elaine Stritch) to town.

Frank is taken by surprise during an on-air interview with Erin's boss; Danny and his new boss clash as they investigate a drive-by shooting. Meanwhile, Jamie and Jenko help out detectives with an apparent suicide.

Holmes and Watson's search for the killer of a woman found encased in cement takes them inside the clean technology industry. Also, Watson takes a giant leap forward regarding her interest in adoption.

A deadly shooting in a diner leads Detectives Fontana (Dennis Farina) and Green (Jesse L. Martin) to a desperate triggerman who sought revenge for his baby sister who died of AIDS at a children's hospital. Further investigation soon reveals that a brilliant doctor (guest star Vondie Curtis Hall) was using the child as a guinea pig for experimental AIDS drugs. Taking the case to court, A.D.A. Jack McCoy (Sam Waterston) finds other youthful victims and must exploit the complicated ethical issues if he is to win a tough murder-one conviction against the passionate physician. Annie Parisse, S. Epatha Merkerson and Fred Dalton Thompson also star.