Despite being the Prime Minister of Sweden, Olof Palme wanted a normal life as possible and often went out without a bodyguard, so was the fateful night of February 28, 1986.

Olof Palme, born in 1927 in Stockholm, took over as Prime Minister of Sweden in 1982. In the evening of February 28, 1986, after watching a comedy at the Grand Cinema in the center of the capital, he and his wife walked towards him.

Palme had previously decided to give the guards a break.

Palme was hit by the back of the neck, while the second bullet grazed Lisbeth, injuring her.

More than 25 witnesses provided testimony to the police.

A series of hypotheses are given.

A day after the assassination, police received reports that the alleged killer might be Victor Gunnarsson, 33, a former member of the European Workers' Party (EAP), who accused Palme of colluding with the intelligence agency.

Given the hatred Gunnarsson has for Palme, it seems plausible to identify him as a killer.

A week after the murder of Palme, police focused on investigating the Kurdish Workers' Party (PKK), armed against Turkey.

On the morning of January 20, 1987, Swedish police arrested 20 Kurds for questioning although there was no evidence, but they found no clue.

In 1998, the PKK claimed that Turkey tried to smear the PKK by slandering them on the assassination of Palme.

Pettersson was questioned in December 1988 and the police took a photo of a suspect.

But half a year later, Pettersson was acquitted and was compensated $ 50,000 for false charges because the police did not work objectively.

Contrary to other witnesses, Lisbeth said that the killer had turned his head to look and she saw the killer's face.

Pettersson was again identified as the main suspect in January 1997.

Another conspiracy theory is that the police were involved in the assassination and they deliberately left the investigation in the wrong direction.

Swedish secret agents were also suspected because Palme had no bodyguards to follow.

In 2012, one of Palme's sons criticized the Secret Service, saying that when Lisbeth sought bodyguards that night, she could not contact anyone.

Just a week before the assassination, Olof Palme made a speech before the Swedish parliament to condemn apartheid racial regime in South Africa.

In September 1996, former South African police Eugene de Kock told the South African Supreme Court that Palme was shot dead for "strong opposition to the Apartheid regime".

In 1986, India purchased SEK 8.6 billion worth of artillery (more than 900 million USD) from Swedish weapons manufacturer Bofors - the largest arms order in Swedish history.

In a 2005 book, the historian Jan Bondeson stated that the theory of Palme was assassinated because someone wanted to stop the deal.

In 2018, the Swedish magazine Filter published a series of articles by journalist Thomas Petterson, identifying the culprit could be Stig Engström, a member of the far-right party Moderates, working for insurance company Skandia a few meters from the scene.

34 years later, the assassination of Olof Palme is still unsolved.

Anna Sundstrom, general secretary of Olof Palme International Center, did not expect any breakthrough information to come out.