Last week Mac discovered that a corpse found buried in Central Park for 15 years is deputy chief Ted Carver's estranged sister who disappeared in 1995. Adding to the mystery is the fact that her credit cards have continued to be used to the present day. Tonight, a body washes up at the South Street Seaport and the investigation begins to unravel a dark secret from Carver's past and leads Mac to believe that Carver (guest star John Larroquette) murdered his sister. — Tim Holland
Read on for previews of How the Grinch Stole Christmas, Supernatural, 20/20, Dennis Miller: The Big Speech, iCarly and Homemade Millionaire.