The scene of a brutal murder is marred by spray painted threats all over the walls and authorities discover a history of death threats that leads to the killer.
A Texas teen and her boyfriend are savagely attacked on Valentine's Day, causing her death while boyfriend escapes - a case that goes cold for 50 years.
When the body of a young criminology student is discovered wrapped in a blanket along an abandoned road in Brooklyn, the authorities suspect an unusual culprit.
When four teenagers are murdered in an otherwise peaceful suburban town, their killings go unsolved for three years until a composite sketch sparks new leads.
After a young college student's death is ruled a homicide, police immediately suspect the victim's boyfriend, but DNA points them in a different direction.
When detectives investigate a middle-aged man's murder, they determine that robbery may not have been the motive after discovering a mysterious greeting card.
A son finds his father dead in their home and calls 911, but when ballistics clear the only suspect, police have to rely on DNA evidence to find the killer.
Police suspect the pilot husband of a flight attendant in her murder when a witness says he saw them out in the middle of snowstorm except her body is missing.
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