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Season 4

38 :04x01 - Pure Evil

Sep/09/2012
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39 :04x02 - The Perfect Suspect

Sep/16/2012
In Arkansas, three women are murdered over the course of three years.

Source: Investigation Discovery

40 :04x03 - Wolf in Sheep's Clothing

Sep/23/2012
The 1995 murder of an 8-year-old girl sparks a manhunt for her killer.

Source: Investigation Discovery

41 :04x04 - Blood Trail

Sep/30/2012
The 1999 slaying of a young woman in Germantown, Wis., is recalled.

Source: Investigation Discovery

42 :04x05 - Mother's Day Murders

Oct/07/2012
In 1985, a young military wife and two of her three little girls are viciously murdered in their home. In a twisted case filled with unusual suspects, the man who gets convicted goes free. But nothing is what it seems.

Source: Investigation Discovery

43 :04x06 - Gruesome Discovery

Oct/14/2012
In 1994, the brutalized body of a young mother is found in a 55-gallon trash barrel. Did she get caught in a love triangle, or did a coworker's obsession go to far? When the shocking truth is untangled, a vicious killer faces final justice.


Source: Investigation Discovery

44 :04x07 - A Bike Ride to Murder

Oct/21/2012
The 1991 murder of a young girl in San Diego is investigated.

Source: Investigation Discovery

45 :04x08 - Murder on the Menu

Oct/28/2012
April, 2004, the dismembered body of a chef is found in trash bags along a highway. Detectives grill everyone from an estranged wife to a blade-happy sous-chef. Finally, the bones give investigators the twisted answer to a bloody puzzle.

Source: Investigation Discovery

46 :04x09 - Triple Threat

Nov/11/2012
June, 1993, a California mother-of-two is found strangled in her home. Was she silenced by her estranged husband? An obsessed coworker? A fledgling serial killer? Undaunted, a veteran detective uncovers evidence that brings a killer to justice.

Source: Investigation Discovery

47 :04x10 - City Under Siege

Nov/18/2012
In 2006, a 20-year-old female is brutally gunned down while walking home from her shift at a Scottsdale, AZ nightclub. Could her death be connected to a violent shooting spree plaguing the area? A tip reveals the gunman's shocking identity.

Source: Investigation Discovery

48 :04x11 - Killings in Kentucky

Nov/25/2012
On a winter morning in 1993, a beloved veterinarian and his wife and son are viciously gunned down in their rural Kentucky home. Investigators leave no stone unturned as the bitter truth behind this tragic, triple-slaying is revealed.

Source: Investigation Discovery

49 :04x12 - No Mercy

Dec/02/2012
In 2001, a mother of triplets is found strangled in her Puyallup, Washington home. Was she the victim of dangerous obsession, or a classic love triangle? As investigators piece together the victim's final moments, a shocking killer is revealed.

Source: Investigation Discovery

50 :04x13 - Maritime Murder

Dec/09/2012

In 1982, a Naval Officer dies from a mysterious illness. When toxicology reports reveal he was poisoned, Naval Investigators sift through a ship of thousands, and countless theories before the truth behind the victim's painful death is revealed.

Source: Investigation Discovery
Warning: Unusual Suspects guide may contain spoilers
Classification: Documentary
Genre: Crime
Status: Returning Series
Network: Investigation Discovery ( USA)
Airs: Sundays at 09:00 pm
Runtime: 60 Minutes
Premiere: May 31, 2010
Episode Order: 13
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