Melissa Chessington Leo (born September 14, 1960), also known as Margaret May II or Margaret May, is an American actress best known for playing Det. Sgt. Kay Howard on the TV series Homicide: Life on the Street from 1993–1997. She has also been a regular on All My Children and The Young Riders. Feature films she has appeared in include A Time of Destiny, Last Summer in the Hamptons, 21 Grams, Confess, and The Three Burials of Melquiades Estrada. In 2009, she received an Oscar nomination for Best Performance by an Actress in a Leading Role at the 81st Academy Awards for her role in Frozen River. Lawrence Toppman of The Charlotte Observer hailed her as "one of America's most underrated character