48-year-old Christopher Halliwell has been sentenced to life imprisonment for the murder of Sian O'Callaghan.
The taxi driver pleaded guilty to the murder of the 22-year-old in March last year.
Robert Murphy looks back at the police investigation:
Chris Halliwell's daughter has appeared on ITV's Daybreak asking her father to give "justice" to the family of the second woman he killed.
Swindon taxi driver Chris Halliwell has been jailed for the murder of Sian O'Callaghan but is he guilty of the murder of other women?
It was a fluke, in a way, that Halliwell was ever caught. But it also needed some good detective work.