Savernake Forest near Grand Avenue - geograph.org.uk - 1369931 — Credit: Brian Robert Marshall · CC BY-SA 2.0
Sian Emma O'Callaghan, a 22-year-old woman, disappeared from Swindon, Wiltshire, in the early hours of 19 March 2011. CCTV captured her leaving the Suju nightclub at 02:52 to walk home to the flat she shared with her boyfriend, Kevin Reape. A text message sent by Reape at 03:24 was later shown, through phone signal analysis, to have reached O'Callaghan's phone in the Savernake Forest area, roughly 12 miles from Swindon. Reape reported her missing to police later that morning.
Police launched a public appeal on 20 March and began searching Savernake Forest, noting that the short time between the CCTV sighting and the phone signal indicated travel by vehicle. Public searches involving around 400 volunteers took place on 22 March, alongside an anonymous £20,000 reward offer for information. On 23 March, Detective Superintendent Stephen Fulcher of Wiltshire Police described the investigation as moving at a "rapid pace" following analysis of phone signal "hot spots." The next day, police issued an appeal concerning a green Toyota Avensis taxi seen between Swindon and Savernake Forest around the time O'Callaghan vanished.
On the afternoon of 24 March 2011, police arrested a 47-year-old taxi driver, Christopher Halliwell, at an Asda supermarket in Swindon on suspicion of kidnapping, seizing a matching green Toyota Avensis taxi. O'Callaghan's body was found later that day in a shallow grave near Uffington, Oxfordshire. Halliwell was charged with her murder on 26 March. At a news conference the same day, Fulcher said tests indicated O'Callaghan had not been sexually assaulted. An inquest opening on 1 April at Oxford coroner's court heard it was likely she died from head injuries, pending confirmation from a Home Office forensic pathologist. Her funeral was held on 18 April 2011.
Halliwell initially pleaded not guilty at a hearing on 31 May 2012, but on 19 October 2012, at Bristol Crown Court, he pleaded guilty to O'Callaghan's murder. He was sentenced to life imprisonment with a minimum term of 25 years, a sentence upheld by the Court of Appeal on 14 December 2012.
It subsequently emerged that a second murder charge against Halliwell, relating to Becky Godden-Edwards — a 20-year-old woman missing since 2007 whose body Halliwell had led police to after his arrest — had been dropped due to a procedural error. A judge ruled Halliwell's confessions inadmissible because Fulcher had failed to caution him and had denied him access to a solicitor, breaching the Police and Criminal Evidence Act 1984. An inquest in April 2013 recorded a narrative verdict that Godden-Edwards's death, believed to have occurred in late 2002 or early 2003, was "unascertained but probably caused unlawfully by a third party." The Independent Police Complaints Commission found Fulcher had a case to answer for gross misconduct; he was found guilty of gross misconduct in January 2014 and resigned from Wiltshire Police in May 2014.
Halliwell was later charged with Godden-Edwards's murder in March 2016 and convicted by a jury at Bristol Crown Court on 19 September 2016. He received a whole life order on 23 September 2016. In September 2022, an Independent Office for Police Conduct investigation found Wiltshire Police had missed opportunities between 2011 and 2014 to bring him to justice sooner for that second murder. The case was later dramatised in the 2019 ITV series A Confession.
Swindon, Wiltshire, England (disappearance); body found near Uffington, Oxfordshire
Case status
solved
Case timeline
2011-03-19
Sian O'Callaghan was last seen on CCTV leaving Swindon's Suju nightclub at 02:52; her boyfriend reported her missing later that morning after a text message sent to her at 03:24 was later traced to Savernake Forest.
2011-03-20
Police issued their first public appeal and began searching Savernake Forest.
2011-03-22
Around 400 members of the public joined a search of Savernake Forest; an anonymous £20,000 reward was offered.
2011-03-23
Police said mobile phone signal analysis had identified 'hot spots' for investigation; Det Supt Stephen Fulcher described a 'rapid pace' of inquiry.
2011-03-24
Police appealed for information on a green Toyota Avensis taxi; Christopher Halliwell was arrested on suspicion of kidnapping and O'Callaghan's body was found near Uffington, Oxfordshire.
2011-03-26
Halliwell was charged with O'Callaghan's murder; police stated tests showed no sexual assault.
2011-04-01
An inquest opening at Oxford coroner's court heard it was likely O'Callaghan died from head injuries.
2011-04-18
O'Callaghan's funeral was held at Kingsdown Crematorium.
2012-05-31
Halliwell pleaded not guilty to murder at a plea and case management hearing.
2012-10-19
Halliwell pleaded guilty to O'Callaghan's murder at Bristol Crown Court and was sentenced to life imprisonment with a 25-year minimum term.
2012-12-14
The Court of Appeal upheld Halliwell's sentence.
2013-04-23
An inquest into the death of Becky Godden-Edwards recorded a narrative verdict of unlawful killing by a third party, cause unascertained.
2013-09
The Independent Police Complaints Commission found Fulcher had a case to answer for gross misconduct.
2014-01
Fulcher was found guilty of gross misconduct and given a final written warning.
2014-05
Fulcher resigned from Wiltshire Police.
2016-03-31
Halliwell was charged with the murder of Becky Godden-Edwards.
2016-09-19
A jury at Bristol Crown Court found Halliwell guilty of Godden-Edwards's murder.
2016-09-23
Halliwell was sentenced to life imprisonment with a whole life order for Godden-Edwards's murder.
2019-09-02
ITV broadcast the first episode of A Confession, a drama series based on the case.
2022-09
An Independent Office for Police Conduct investigation found Wiltshire Police had missed opportunities between 2011 and 2014 to bring Halliwell to justice sooner.
Best coverage
Titles and descriptions are the creators’ own and may not reflect current legal status; see the dossier above for sourced case facts.
VIDEO
That Chapter / 24 min
The Taxi Sadist Christopher Halliwell
People
Sian O'Callaghan
VICTIM
22-year-old woman who disappeared from Swindon on 19 March 2011 and was found murdered near Uffington, Oxfordshire, on 24 March 2011
Christopher Halliwell
CONVICTED
Taxi driver who pleaded guilty on 19 October 2012 to the murder of Sian O'Callaghan and was later convicted in 2016 of the murder of Becky Godden-Edwards
Becky Godden-Edwards
VICTIM
20-year-old woman reported missing in 2007 whose body was found after Halliwell's arrest; an inquest recorded her death as probably caused unlawfully by a third party
Stephen Fulcher
LAW ENFORCEMENT
Detective Superintendent of Wiltshire Police who led the investigation and was later found guilty of gross misconduct for procedural breaches during Halliwell's questioning
Roles reflect public records and court outcomes at the time of writing — supporting citations are on file under Sources.
Archival records
archival location
Savernake Forest near Grand Avenue - geograph.org.uk - 1369931
Credit: Brian Robert Marshall · CC BY-SA 2.0 · Source
Sian O'Callaghan, a 22-year-old woman from Swindon, disappeared after leaving a nightclub in the early hours of 19 March 2011; her body was found near Uffington, Oxfordshire, five days later. Taxi driver Christopher Halliwell pleaded guilty to her murder in October 2012 and was sentenced to life imprisonment.
Where did the murder happen?
Swindon, Wiltshire, England (disappearance); body found near Uffington, Oxfordshire.
Who was convicted?
Christopher Halliwell (Taxi driver who pleaded guilty on 19 October 2012 to the murder of Sian O'Callaghan and was later convicted in 2016 of the murder of Becky Godden-Edwards).
