On the night Sian O'Callaghan disappeared, Christopher Halliwell had signed off from work but, instead of going home, he cruised the streets of Swindon in his green Toyota Avensis taxi looking for a victim.
The court heard that he took Miss O'Callaghan to Savernake Forest where he murdered her.
Police discovered that, in the 24 hours after Miss O'Callaghan was abducted, Halliwell made four visits to the area where her body had been hidden.
Prosecutor Ian Lawrie QC told the court: "He had carried out a reconnaissance for a possible deposition site for Sian O'Callaghan."
By the early hours of March 21, Halliwell had moved Miss O'Callaghan's body from Savernake Forest to the spot where it was later found.
He then attempted to cover his tracks by cleaning his car and burning his seat covers.
What is moral is not always legal. That's the hard and uncomfortable lesson of the investigation into the disappearance of Sian O'Callaghan.
Christopher Halliwell to serve 30 years for the murder of Sian O'Callaghan. But escapes justice over second murder after police blunder.