Judicial boundary: this page distinguishes the district court’s ruling on criminal responsibility from the final Supreme Court outcome. Gunnar Rúnar Sigurþórsson admitted the killing; the Supreme Court concluded that he was criminally responsible and sentenced him to 16 years.
The discovery in Hafnarfjörður
Shortly before noon on 15 August 2010, Hannes Þór Helgason was found dead at his home in the Háaberg area of Hafnarfjörður. Police identified him publicly the following day. He had been born in 1973 and managed the confectionery company Góa, a family business founded by his father.
The Metropolitan Police treated the death as a homicide from the outset. Its public notices emphasized that the inquiry was extensive and that investigators did not believe the home had been selected at random. Officers interviewed many people, examined the neighbourhood and appealed for information about movements around the property during the night.
Hannes is remembered here as the person whose life was taken, not as a device in the offender’s story. Details unnecessary to understanding the investigation are omitted.
The investigation and arrest
On 26 August, police arrested an Icelandic man in his twenties after new evidence produced what authorities described as reasonable suspicion. The following day, a court remanded him in custody. Contemporary reporting identified the arrested man as Gunnar Rúnar Sigurþórsson, who knew Hannes and Hannes’s partner.
Investigators linked Gunnar Rúnar to the case through a combination of physical and circumstantial evidence. Reporting on the proceedings described blood traces, footwear evidence and surveillance footage connected to the disposal of items. The police inquiry was formally completed in November 2010 and sent to the state prosecutor.
Evidence gathered during an arrest does not by itself prove guilt. In this case, however, Gunnar Rúnar later admitted that he had entered Hannes’s home and killed him. The prosecution and courts then had to determine both responsibility for the act and whether his mental condition excluded criminal punishment.
Admission and prosecution
Gunnar Rúnar repeated his admission when the charge was presented in November 2010. Court reporting said that he had planned the attack over a period of months and had taken steps intended to avoid detection. The motive described in his own account involved an obsessive attachment to Hannes’s partner.
An admission does not remove the need for judicial scrutiny. The record included the surrounding evidence, expert psychiatric opinions and the defendant’s conduct before and after the killing. The central legal dispute became whether he understood the nature of what he had done and could control his actions to the degree required for criminal responsibility.
The district-court ruling
On 1 March 2011, the Reykjanes District Court found Gunnar Rúnar responsible for causing Hannes’s death but concluded that he was not criminally responsible because of his mental condition. The court ordered him held under security measures at an appropriate institution rather than imposing an ordinary prison sentence.
Three psychiatrists had supported the conclusion that he was not criminally responsible. The decision was not an acquittal of the underlying act: it accepted that he had killed Hannes while withholding penal punishment on the basis of mental incapacity. Prosecutors appealed that legal conclusion.
The Supreme Court’s final judgment
On 13 October 2011, Iceland’s Supreme Court reversed the district court on criminal responsibility. The Supreme Court concluded that Gunnar Rúnar understood the nature of the offence and was sufficiently able to control his conduct. It emphasized the deliberate planning, the purposeful execution of the act and the steps taken afterward to avoid detection.
The Supreme Court sentenced him to 16 years in prison. Contemporary reports also recorded compensation orders for Hannes’s parents and partner. He was transferred from the secure psychiatric unit to Litla-Hraun prison after the ruling.
The archive therefore classifies the case as adjudicated. The controlling outcome is not the district court’s initial security order but the Supreme Court’s final determination of criminal responsibility and sentence.
Status and later record
Later Icelandic reporting continued to describe Gunnar Rúnar as serving the 16-year sentence and documented his transfer to a more open prison setting by 2017. That information concerns sentence administration; it does not alter the conviction or the Supreme Court’s responsibility finding.
No source located for this review reported that the 2011 Supreme Court judgment had been overturned. The status is therefore presented as a completed prosecution with a final 16-year sentence, while avoiding speculation about release dates or present custody beyond the verified reports.
Verified timeline
- Night of 15 August 2010: Hannes Þór Helgason is killed at his home in Hafnarfjörður.
- 26–27 August 2010: police arrest Gunnar Rúnar Sigurþórsson and obtain a remand order after new evidence.
- November 2010: the police complete the investigation; Gunnar Rúnar admits the killing in court after being charged.
- 1 March 2011: the district court finds him not criminally responsible and orders secure institutional care.
- 13 October 2011: Iceland’s Supreme Court reverses that conclusion and imposes a 16-year prison sentence.
- Current classification: solved / adjudicated through a final Supreme Court judgment.
Frequently asked questions
When was Hannes killed?
During the night of 15 August 2010 at his home in Hafnarfjörður.
Who admitted killing him?
Gunnar Rúnar Sigurþórsson admitted responsibility after his arrest.
What did the district court decide?
It found him not criminally responsible and ordered secure institutional care.
What changed on appeal?
Iceland’s Supreme Court found him criminally responsible and imposed a 16-year prison sentence on 13 October 2011.
Why is the case classified as adjudicated?
The defendant admitted the act, and a final Supreme Court judgment established criminal responsibility and sentence.
Sources and source-quality review
- Metropolitan Police — extensive homicide investigation20 August 2010 · official account of the victim, investigative scope and targeted-entry assessment.
- Icelandic police — arrest and remand request27 August 2010 · official notice of the arrest and reasonable-suspicion basis.
- Vísir — the defendant’s admission22 November 2010 · court reporting on the admission, planning and chronology.
- Vísir — district-court outcome1 March 2011 · ruling on criminal responsibility and secure institutional care.
- Vísir — Supreme Court sentence13 October 2011 · final responsibility finding and 16-year prison sentence.
Editorial review: the initial facts and arrest were checked against police notices; the admission, lower-court ruling and Supreme Court outcome were verified separately through contemporaneous Icelandic court reporting. Psychiatric evidence is described only as part of the legal record, without diagnostic speculation.