The 1953 murder of a white school teacher, a communist sympathizer who was involved in civil-rights issues, is reopened after the victim's youngest son asks for it to be reinvestigated. The probe reveals that the slain man was killed on the same day that the Rosenbergs were executed and was set to testify the next day before the House Committee on Un-American Activities.

The headless torso of a woman who disappeared in 1985, on the same day she filed domestic-abuse charges against her husband, is found by hikers in a wildlife preserve. The investigation quickly leads to the grisly discovery of 8 more decapitated bodies, the victims of a serial killer.

The team re-opens the 2000 case of a prominent Puerto Rican assistant district attorney when rumors about his connection to a large amount of money gone missing at the time of his death start to circulate. However, his widow insists that the claims are not true. The re-investigation reveals that the victim was prosecuting a murder trial and the man convicted for the crime after his death may possibly be innocent.

When a dying boxing referee makes a confession about a 1976 fight, the team re-opens the case in which an underdog fighter, arranged to fight against a much more qualified boxer, took a heavy beating in the match and died only moments afterwards.

After a murder weapon connected to the 1987 drive-by shooting of a little girl turns up, Det. Rush and her team re-open the case. The team slowly tracks back the gun's previous owners until the shocking original owner is finally revealed.

Rush and the team investigate the 1969 murder of a 19-year-old girl whose body was found in her boyfriend's apartment the day he fled to Canada to avoid fighting in Vietnam.

A man claims that he was wrongfully convicted of the 1982 murder of his rich wife. The case is reopened when the victim's rare ring is discovered worn by a recently deceased junkie.

The murder case of a young mill worker is re-opened when Rush learns that a recent parolee admitted to stealing money off the victim's body.

A convicted serial killer will be paroled after 25 years in prison unless Lilly and her team can connect him to the 1977 murder of a young doorman found strangled on a train platform. The killing is eerily similar to other murders committed by the man. Making the case more urgent is the fact that the convicted strangler hints that he will kill again upon release. Elsewhere, Scotty confronts Christina about her past and tries to get her to talk to a New York detective.