Season 4 |
| 39 :04x01 - Love to Death; Unmasked (Jun/15/2006) | | A convenience-store shooting in Memphis that left a man dead is investigated; and Miami detectives probe a murder in an affluent area. | |
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| 40 :04x02 - Inner Demons; Kids with Guns (Jun/22/2006) | | A man is found murdered outside of his apartment in Miami; and Memphis detectives investigate a triple shooting that left two men dead and a third in critical condition. | |
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| 42 :04x04 - Pre-emptive Strike/Unlucky (Jul/20/2006) | | In Memphis, a killer barricades himself in an apartment; Dallas detectives respond when a decomposed body is found, and it's learned that the victim was murdered. | |
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| 47 :04x09 - Fool for Love/Dumped (Sep/14/2006) | | In Dallas, a decomposed body is found and an investigation gets under way; Memphis detectives search for the killer or killers who dumped a body in a field. | |
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| 48 :04x10 - The Wrong Man/Five Points Payback (Sep/21/2006) | | A drive-by shooting in Memphis leads to a search for two brothers suspected of committing the crime; and Dallas detectives investigate the murder of a man who was shot to death in a van. | |
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| 46 :04x12 - Crossfire/School Ties (Aug/31/2006) | | In Miami, a woman is shot and killed at a convenience store, but the surveillance footage indicates that a man was the intended victim, and detectives try to find him to save his life; the murder of a man shot in the middle of the day is investigated. | |
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| 50 :04x12 - Family Affair/The Hustler (Oct/05/2006) | | A pool hustler is found dead in a motel room in Memphis; a Dallas woman is found stabbed, beaten and burned, and her niece and her mother are missing. | |
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| 51 :04x13 - Motel Massacre/Pure Innocent (Oct/12/2006) | | Memphis detectives search for the shooter in a gunfight that left two men dead and another man injured; and Kansas City detectives search for the person who shot a 2-year-old child. | |
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| 53 :04x15 - Houdini/Innocence Lost (Nov/30/2006) | | In Memphis, detectives search for a man suspected of killing a gas-station clerk; and a Miami detective investigates the murder of a 9-year-old girl. | |
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| 54 :04x16 - Wrong Turn/Deadly Dance (Dec/07/2006) | | A tourist who's in Miami for his son's 17th birthday is murdered; and a shooting at a high-school dance leaves one teen dead and another one in critical condition. | |
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| 59 :04x17 - Family Secrets/Clipped (Jan/11/2007) | | Memphis detectives investigate the murder of a man who was shot in his parked car; and a Phoenix detective probes the shooting death of a young man found in the parking lot of a bar. | |
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| 56 :04x18 - Senseless/Get that Money (Dec/21/2006) | | A young man is murdered in Kansas City, Mo., and the victim's cell phone may lead the detectives to the killer; in Memphis, a woman is killed in the neighborhood where the investigating detective grew up. | |
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