Season 4

October 8, 2006

When the remains of a sandhog miner who disappeared in 1947 are found in a subway service tunnel, the team is prompted to re-open the case when they suspect the victim might have been murdered for being a union activist.

October 15, 2006

A 6-month-old girl's 1982 death, originally ruled to be a result of sudden-infant-death syndrome, is investigated when new evidence reveals the baby may have drowned. Also, Lilly learns that Ray is in the hospital after apparently being beaten.

October 22, 2006

Lilly re-opens a 2003 case in which an autistic boy's parents were shot in their car when Joseph brings her information that the boy might have seen the killer.

October 29, 2006

The apparent 1958 suicide of a popular rock-and-roll DJ is reinvestigated after a documentary filmmaker discovers a tape recording made at the time of the victim's death by gunshot at his radio station. Also, Valens tries to get his brother to testify against a suspected pedophile.

November 5, 2006

The 1979 murder of a schoolteacher who was stabbed to death in a wooded area is reopened when the victim's bloodstained jacket is found stuffed in a tree trunk with a happy-face key chain in a pocket. The case was originally investigated by Jeffries when he was a rookie detective.

November 12, 2006

The 1975 disappearance of an 8-year-old girl who was never found is reinvestigated after a note written by the girl shortly before she vanished turns up. Their friendship rattled many in the predominantly white neighborhood and the girls quickly became targets of hatred.

November 19, 2006

A homely 33-year-old woman is gunned down in an alley in 1989 and her unsolved murder is reinvestigated when a tape of the victim, made for a dating service, turns up in a suicide victim's apartment. Apparently, it was what the man was watching when he killed himself. Also, Vera moves into an apartment of his own

December 3, 2006

The team re-investigates the 1968 death of a policeman who was shot in his patrol car. The case was then ruled as a drug bust gone bad, but new evidence now reveals the victim may have been romantically involved with his partner.

December 10, 2006

Lilly and Valens travel to Nashville and Knoxville to investigate the 2000 murder of a country-music singer who was gunned down outside of a Philadelphia bar where he and his band had recently played. The unsolved case is reopened when the gun used in the homicide turns up.

January 7, 2007

Lilly investigates the murder of a 17-year-old prep-school student who disappeared in early 2006 and whose body is found stuffed in an oil drum outside an abandoned warehouse in a drug-infested part of the city. Also, Vera pays a parking ticket for his neighbor and later asks her out on a date.

January 14, 2007

Lilly investigates the 1996 murder of a wealthy divorced woman who was found dead in her ex-husband's indoor swimming pool. The original investigation ruled the death accidental, but new evidence suggests it was a homicide.

January 28, 2007

In 2002, two kids were shot in front of two different schools on the same day at precisely 8:03 a.m. It's the fifth anniversary of the shootings, and Kat Miller wants to re-open the murders because she feels the cases are connected.

February 18, 2007

Lilly investigates the deaths of a married couple who perished in 1981 when a supposedly accidental gas-leak explosion set their house on fire. The case is reopened when fragments of a bomb are discovered at the house during renovations. Back at headquarters, Stillman takes care of his 4-year-old grandson.

March 4, 2007

Lilly investigates the 1964 murder of a 17-year-old girl who was sent by her parents to a home for unwed mothers, where she gave birth to a girl. The next day the teen was killed. The case is reopened when the victim's daughter comes forward, having just learned that she was adopted and that her biological mother was slain.

March 11, 2007

When a body is found in a dumpster, the team re-opens the 1984 case of a murdered teenage boy who wanted to become a dancer against his father's wishes.

March 18, 2007

The 1999 murder of a homeless woman, whose body is found at the bottom of a river in a station wagon, is investigated.

March 25, 2007

A father pushes a registered sex offender off of a building and threatens to kill a different sex offender each day until the cold-case unit solves his son's 1987 rape and murder.

April 1, 2007

The 1997 murder of a 16-year-old girl high-school cheerleader is investigated after an anonymous confession is discovered in a modern-art exhibit.

April 8, 2007

The team re-investigates their oldest cold case yet, the 1919 murder of a young woman who was a passionate advocate for women's right to vote.

April 15, 2007

The 2005 murder of a longshoreman who accidentally became involved in a human-trafficking ring run by the Russian mob.

April 29, 2007

The 1998 death of a terminally ill man who died months before he was expected to is investigated after a nurse confesses to six so-called mercy killings.

May 6, 2007

In the fourth season finale, a hostage situation arises when the entire team is held captive while they're investigating the 2006 killings of a family who had just moved into a new house.