第 4 季 共 24 集
播出时间：2006年9月25日
第 1 集 Rampage
播出时间：2006年9月25日
In 1995, two teenage boys went on a shooting spree at a local mall and committed suicide shortly afterwards. The team is prompted to re-open the case when new evidence suggests that there may have been a third shooter who got away.
第 2 集 The War at Home
播出时间：2006年10月2日
The team re-opens the 2004 case of a female veteran of the Iraqi War when her prosthetic arm is found in a river. Meanwhile, Scotty visits his older brother in connection with a case that brings up painful memories from their childhood.
第 3 集 Sandhogs
播出时间：2006年10月9日
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.
第 4 集 Baby Blues
播出时间：2006年10月16日
Lilly re-investigates a 1982 case where a newborn baby died under suspicious circumstances of what was reported as SIDS (sudden infant death syndrome).
第 5 集 Saving Sammy
播出时间：2006年10月23日
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.
第 6 集 Static
播出时间：2006年10月30日
The team re-opens the 1958 case of a local celebrity, a radio DJ nicknamed "The Hawk", when they discover his death was staged to look like a suicide.
第 7 集 The Key
播出时间：2006年11月6日
When new evidence of a murder case from 1979 is found, Det. Jeffries – who then worked on the case as a rookie cop – sets out to find the killer, fulfilling the promise he made to the victim's daughter 27 years ago.
第 8 集 Fireflies
播出时间：2006年11月13日
When an undelivered letter with a missing child's handwriting on it shows up, the team is prompted to re-open the case of an 8-year-old girl who disappeared in 1975.
第 9 集 Lonely Hearts
播出时间：2006年11月20日
The team re-investigates the unsolved 1989 murder of a woman shot in an alley when the victim's video dating tape shows up in a dead man's apartment.
第 10 集 Forever Blue
播出时间：2006年12月4日
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.
第 11 集 The Red and the Blue
播出时间：2006年12月11日
When Jeffries' former partner comes forth with new evidence of the 2000 murder of a country singer, Lilly must travel to Knoxville, Tennessee with the reluctant Scotty in tow.
第 12 集 Knuckle Up
播出时间：2007年1月8日
When a video clip of a missing student is found on the Internet, the team re-investigates the case of a talented 17-year-old boy who disappeared just a year before in early 2006.
第 13 集 Blackout
播出时间：2007年1月15日
The team re-opens the 1996 case of a wealthy woman who was afraid of the dark and died during a citywide electricity blackout.
第 14 集 8:03 AM
播出时间：2007年1月29日
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.
第 15 集 Blood on the Tracks
播出时间：2007年2月19日
When traces of an explosive are found in a house, the team re-opens the 1981 case of a married couple who died in the same house in what was then ruled as an accidental gas leak.
第 16 集 The Good-Bye Room
播出时间：2007年3月5日
Lilly re-opens the 1964 case of a murdered 17-year-old girl who was killed the day after giving birth to a baby girl in a home for unwed mothers.
第 17 集 Shuffle, Ball Change
播出时间：2007年3月12日
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.
第 18 集 A Dollar, A Dream
播出时间：2007年3月19日
The team re-opens the 1999 case of a murdered homeless woman when her remains are found in a station wagon at the bottom of the river.
第 19 集 Offender
播出时间：2007年3月26日
A desperate father turned serial killer coerces the team into taking another look of his son's 1987 murder.
第 20 集 Stand Up and Holler
播出时间：2007年4月2日
The team re-opens the 1997 case of a 16-year-old high-school cheerleader when they discover an anonymous confession to the girl's murder.
第 21 集 Torn
播出时间：2007年4月9日
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.
第 22 集 Cargo
播出时间：2007年4月16日
The team re-opens the 2005 case of a killed longshoreman who got tangled up with the Russian mob.
第 23 集 The Good Death
播出时间：2007年4月30日
The team re-opens the 1998 case of a terminally ill man when a nurse comes forth confessing to euthanizing six of his former patients.
第 24 集 Stalker
播出时间：2007年5月7日
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.
