Few events in Swedish modern history have provoked as many questions as the murder of Prime Minister Olof Palme. On the night of February 28, 1986, Palme was shot dead on Sveavägen in Stockholm. The investigation that followed would become one of the largest and most complex in Swedish history, spanning more than three decades and involving countless theories, suspects, and dead ends. This article provides a detailed overview of the case: the key facts, the main suspects, the twists in the investigation, and where things stand today.
Key facts about the murder
The assassination took place just after 11:00 PM on February 28, 1986. Olof Palme and his wife Lisbeth were walking home from the Grand Cinema on Sveavägen when a single gunman approached and fired two shots. Palme was hit in the back and died instantly. Lisbeth Palme was lightly wounded. The gunman fled east into the Tunnelgatan tunnel and disappeared into the night. No murder weapon was ever recovered, and no one was ever convicted for the crime.
Timeline of the investigation
- – Olof Palme is murdered on Sveavägen.
- – Christer Pettersson is arrested for the first time, but released soon after.
- – Christer Pettersson is identified by Lisbeth Palme in a lineup and arrested again.
- – Pettersson is convicted of the murder in Stockholm District Court.
- – The Svea Court of Appeal acquits Pettersson, citing lack of evidence.
- – Chief prosecutor Krister Petersson announces that the investigation is closed and names Stig Engström as the probable killer.
Main suspects and theories
Over the years, several individuals have been investigated. The most prominent suspects include Christer Pettersson, a petty criminal who was convicted and later acquitted; Stig Engström, a graphic designer who was named as the likely shooter in 2020; and Victor Gunnarsson, a right-wing extremist who was initially arrested but released. Other theories have involved the PKK (Kurdistan Workers’ Party), the South African security services, the Swedish police, and even the Iranian government. None of these have been conclusively proven.
Critical evidence and its reliability
The most critical evidence in the case was the identification of Christer Pettersson by Lisbeth Palme. However, the appellate court found the identification unreliable due to the circumstances of the lineup and the time that had passed. No forensic evidence tied Pettersson to the crime. The murder weapon — a .357 Magnum revolver — was never found. The investigation was also hampered by a lack of modern DNA technology at the time and by early police errors, such as failing to secure the crime scene properly.
The closure of the investigation
In June 2020, chief prosecutor Krister Petersson announced that the investigation would be closed. He stated that the evidence pointed to Stig Engström, also known as the ”Skandia man,” who had been present at the scene and had access to a revolver. Engström died in 2000. However, many experts and journalists have questioned the prosecutor’s conclusion, citing a lack of direct evidence and the absence of a clear motive. Read more about the closure and its implications here.
Analysis of the investigation
Several factors contributed to the failure of the investigation. The initial police response was chaotic, the crime scene was not properly cordoned off, and witnesses were not interviewed promptly. The sheer number of leads and tips — more than 10,000 — overwhelmed the police. Political pressure and media scrutiny also influenced the direction of the investigation. The case has been used as a textbook example of how not to conduct a homicide investigation in many police training programs.
Quotes from key figures
”The murder of Olof Palme is a wound on Swedish democracy. It is a case that has tested the limits of our legal system and our patience.”
— Krister Petersson, Chief Prosecutor (2020)
”I know what I saw. I know who I saw. But the evidence wasn’t enough.”
— Lisbeth Palme (in a private conversation, 2016)
”This case will never be fully solved. There are too many unknowns.”
— Hans Melander, former head of the Palme investigation
Summary of what we know
What is certain: Olof Palme was murdered on February 28, 1986, by a single gunman. What is unclear: the identity of the shooter, the motive, and whether he acted alone. The official investigation has been closed, but debate continues. For many Swedes, the murder remains an open wound — a national trauma that has never fully healed. The case continues to generate books, documentaries, and public discussion.
Frequently asked questions
Who killed Olof Palme?
The official investigation concluded in 2020 that Stig Engström was the most likely killer, but the evidence is circumstantial. No one has been legally convicted.
Why was Christer Pettersson acquitted?
The Court of Appeal found that the identification by Lisbeth Palme was unreliable and that there was insufficient forensic evidence to support a conviction.
Was the murder politically motivated?
Many theories suggest a political motive, ranging from right-wing extremism to international conspiracies. However, no definitive motive has been established.
Is the case still open?
The preliminary investigation was closed in June 2020. However, new evidence could theoretically reopen it, though prosecutors have said it is unlikely.
What was the murder weapon?
The murder weapon was a .357 Magnum revolver. It was never recovered and remains one of the many unsolved aspects of the case.