Law & Order: Criminal Intent S07E01 - Amends

In the season seven opener, a cop is shot in the line of duty and Detectives Robert Goren and Alexandra Eames race to the scene. Eames recognizes the victim: her husband's partner from the night he was murdered. It turns out that although the two murders were eight years apart, the only way to solve the current case is to reinvestigate her husband's murder as well.