Peter Sutcliffe, known as the Yorkshire Ripper, has died aged 74.
Sutcliffewas convicted of murdering 13 women and attempting to murder seven others in1981.
His crimes terrified the north of England.
He was an inmate at FranklandPrison, Durham.
How did Ripper investigation change policing?
Sky News UK Studios
Crime correspondent Martin Brunt looks back on the investigation into Peter Sutcliffe and how it changed policing.
