Most killers know their victims, but there has been an alarming rise in 'stranger murders', and these are the shocking stories of people killed by someone they had never previously met.
The shocking case of a woman stabbed more than 70 times by a teenager who researched murder and serial killers on the internet. (S2, ep 1)
A teenager starts a new life to provide for his young daughter, but his dreams are cruelly dashed while hitchhiking in the US. (S2, ep 2)
In 1984, Jonelle Matthews is dropped home after a Christmas performance. But when her father returns, she isn't there. (S2, ep 3)
A father-and-son duo are approached by a stranger who is in the middle of a killing spree in a small Michigan city. (S2, ep 4)
Things end in tragedy when 27-year-old Michael Hoolickin steps in to defend a woman being hit by her brother. (S2, ep 5)
A Sensleess Act: Lauren Landavazo: As 13-year-old Lauren walks home from school, a loner is getting ready to ensure that if he can't have her, no one can. (S2, ep 6)
When 18-year-old Conner Marshall is enjoying a holiday with friends, he's approached late at night by a stranger. (S2, ep 7)
As Mikey Rainsford gets ready to meet his girlfriend, he's unaware that two strangers are lurking outside, out for revenge. (S2, ep 8)
14-year-old Jermaine Cools is walking home when a fight breaks out involving an older boy brandishing a huge machete. (S2, ep 9)
Reagan Tokes: Reagan, a 21-year-old psychology student, is kidnapped by a 32-year-old sex offender with devastating consequences. (S2, ep 10)