While some cases are solved and others continue to grow cold, there have been some developments

in a few cases previously covered on trace evidence.

A DNA test taken by an unsuspecting woman has shown light into one of the darkest unsolved

cases in American history.

William Bradford Bishop violently and brutally executed his wife, mother, and three sons

on a cold winter evening in March of 1976.

Now more than 40 years later, a woman seeking answers about her own past has unlocked the

door to a secret life that no one knew existed.

The murder of pediatric nurse Sonia Vorashin shocked the residents of Orangeville, Ontario,

Canada, in August of 2010.

Despite exhaustive efforts from both the Orangeville and Ontario provincial police, the motive

and identity of Sonia's killer has never been determined.

However, 11 years later, investigators have revealed some new details and their belief

that it is only a matter of time.

Twenty-year-old Kelly Burke Dove made three phone calls to police in Harrisonburg, Virginia

during the early morning hours of June 18, 1982.

Her last call was cut off in mid-sentence, and when police arrived, the young mother

was nowhere to be found.

For years, police work to try and identify a suspect to no avail.

However, under the leadership of a new investigation, Kelly's case may finally break open.

Thirty-eight-year-old Sandra Sali vanished from Macedon, New York on March 24, 1994.

Pregnant at the time, many theorized that Sandra may have gone off on her own to start a new

...