
An in-depth look at some of the world's most dangerous murderers.

Randy Kraft, a well-spoken, well-respected computer expert...and a prolific serial killer.

When Mary Gough is found dead in her family home, her husband Colin Whelan appears shocked.

Less than 20 minutes after dropping her children off at school, Rachel O'Reilly is murdered.

In April 1997, 27-year-old Rachel McGrath is stabbed to death by an unknown attacker in a car park.