Is Derbyshire ‘double killer’ still on the loose?

In 1973 a young woman named Wendy Sewell was murdered in a brutal attack at Bakewell cemetery.
Wendy Sewell and Barbara Mayo.Wendy Sewell and Barbara Mayo.
Wendy Sewell and Barbara Mayo.

The killer was never caught and could still be at large. They may have even committed another infamous murder even close to home near Chesterfield..