A SERIAL killer who murdered a young Tynedale woman could have claimed the lives of 20 more victims, it has been claimed. 

Backpacker Caroline Clarke of Slaley near Hexham, who died in Australia in 1992, was one of seven people killed by Ivan Milat over a four-year period between 1989 and 1993. 

The 21-year-old disappeared along with her travel companion Joanne Walters (22) in Australia in 1992.

Milat also murdered three German and two Australian backpackers after picking them up while they were hitchhiking. He died in prison aged 74, in October 2019. 

Now Milat is the focus of a crime documentary on Australia's Channel 7, in which experts claim to expose new evidence that Milat was responsible for even more deaths.

The documentary, Ivan Milat: Buried Secrets, was set to be screened at the weekend.