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Season 4

45 :04x01 - Identifying Remains

When a work crew uncovers a woman’s skull on a stretch of Florida highway, investigators try to determine who she is and find her killer. But it will take a bizarre discovery over a thousand miles away before the grizzly truth is finally revealed.

Source: Investigation Discovery

46 :04x02 - What Happened in Vegas?

Single mother Donna Kitowski heads to a Las Vegas supermarket late at night but never returns.

Source: Investigation Discovery

47 :04x03 - If Dogs Could Talk

When Cathy Lamb is brutally murdered in her Palm Beach, Florida home, the only witnesses are her three blood-soaked dogs. The gruesome scene baffles detectives. And with no suspects and no murder weapon, they have only their suspicions to go on.

48 :04x04 - Who Took Polly Klaas?

During a slumber party, a man appears at 12-year-old Polly Klaas's bedroom door and abducts her at knife point.

Source: Investigation Discovery

49 :04x05 - Where Murders Go Unsolved

The rape and murder of a 19-year-old journalism student in her bed is the latest in a string of unsolved homicides in a college town.

Source: Investigation Discovery

50 :04x06 - Highway to Hell

Investigators believe a serial robber, rapist, and murderer is terrorizing cities up and down the west coast. And as the death toll rises, police jurisdictions in three states join the hunt for the ‘I-5 Killer.’

Source: Investigation Discovery

51 :04x07 - Have You Seen Our Sister?

A major media campaign is launched after a hardworking single mother is murdered.

Source: Investigation Discovery

52 :04x08 - Texas Massacre

The residents of Kilgore, Texas are reeling from the execution-style slaying of five people abducted from a fast-food restaurant. But it will take several decades and major advances in DNA technology before the perpetrators can be brought to justice.

Source: Investigation Discovery

53 :04x09 - The Ballad of Melissa Love

Country singer Melissa Haferman has just recorded her first CD in Nashville when her lifeless body is found in a vacant lot near the Louisville, Kentucky bus depot. And it will take four years and a macabre discovery before police close in on her killer.

Source: Investigation Discovery
Starring Roles: Miranda Reynolds as Melissa Love

54 :04x10 - A Chance Encounter

A 20-year-old woman is gunned down in a Maryland suburb and the random crime is a mystery from the start. With few leads and virtually no evidence, the case goes cold. And it will take 25 years before investigators finally close in on the killer.

Source: Investigation Discovery

55 :04x11 - Who Do You Trust?

After the mutilated body of 17-year-old Shauna Card is discovered on the bathroom floor in her Orlando, Fla., home, it will take years for investigators to finally crack the case.

Source: Investigation Discovery

56 :04x12 - When the Smoke Clears

Authorities in Washington are stunned when a mother of three dies from cyanide poisoning. And the resulting murder investigation eventually reveals a pattern of tampered boxes and blister packs, more deaths, and a reptilian story of greed and betrayal.

Source: Investigation Discovery

57 :04x13 - Three Times the Pain

A popular college student is brutally stabbed to death during her first-ever night shift at a convenience store in Great Falls, Montana. And it will take a decade before an informant comes forward with a story that leads the cops to her killer.

Source: Investigation Discovery
Classification: Documentary
Genre: Crime | Drama | Family | Mystery
Status: Returning Series
Network: Investigation Discovery ( USA)
Airs: Tuesdays at 08:00 pm
Runtime: 60 Minutes
Premiere: April 06, 2012
Episode Order: 18
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