Malta's police chief resigned on Friday following ongoing criticism of his handling of the 2017 murder of Daphne Caruana Galizia, a journalist who investigated corruption.

The country's new prime minister, Robert Abela, announced Lawrence Cutajar's resignation on Friday, four days after taking office with a pledge to improve the rule of law on the island nation.

"In his resignation letter, Mr Cutajar wrote that the appointment of a new prime minister demanded change so that necessary reforms to the [police] force could start taking place," Abela said in a press conference.

Read more: Malta: Robert Abela to replace scandal-tarnished Joseph Muscat as PM

Caruana Galizia's son Paul tweeted that he had called for the resignation two years ago.

"How they mocked us when, a day after my mother was assassinated, we called for the resignations of the prime minister, police commissioner, and attorney general, and the investigation of Keith Schembri," he wrote.

"Watch them fall," he added.

Activist group Occupy Justice said the resignation was "long overdue."

Abela has shaken the political landscape in his few days in office, in an attempt to distance himself from the scandals attached to his predecessor.

With a Cabinet reshuffle earlier this week, he hoped to give Malta's ruling Labour party a new lease of life. However, the attorney general, Peter Grech, has remained in his role despite widespread calls for his resignation.

Former Maltese police chief Lawrence Cutajar

What does Cutajar's resignation mean?

Ex-police chief Cutajar received criticism from international bodies for his reluctance to investigate allegations of financial crime relating to the top aide of former Prime Minister Muscat.

In January 2018, a delegation of EU lawmakers noted a "lack of police action, despite the very serious evidence of maladministration involving even members of the Maltese government."

Read more: How a journalist's murder haunts Malta's ruling elite

Activists hope that Cutajar's resignation will lead to a more open investigation into Caruana Galizia's murder and better police scrutiny of senior figures.

Abela will appoint the new police commissioner next week. The prime minister's role has been criticized as too powerful, as they directly appoint police chiefs and judges.

Watch video 02:52 Share Son of murdered journalist speaks of plot to kill mother Send Facebook google+ Whatsapp Tumblr linkedin stumble Digg reddit Newsvine Permalink https://p.dw.com/p/3TxWN Son of murdered journalist speaks of plot to kill mother

What has happened since the murder of Caruana Galizia?

Abela's predecessor, Muscat, stepped down amid criticism of his handling of the murder of Caruana Galizia.

Muscat was embroiled in controversy after a senior aide, Keith Schembri, was implicated in the murder following the arrest of wealthy businessman Yorgen Fenech.

Fenech was charged in November as an accomplice to murder. Three other men are on trial for allegedly detonating the bomb that killed Caruana Galizia in October 2017.

Read more: Opinion: Malta is a wake-up call

Caruana Galizia's sons, along with a number of activist groups, have long fought for justice for their mother, accusing senior government figures of being complicit in her murder or failing to hold up the rule of law.

Caruana Galizia, who was killed in a car bomb attack, fought to expose and denounce corruption linked to Malta's elite.

Watch video 00:30 Daphne Caruana Galizia’s sister spoke to DW shortly after Yorgen Fenech appeared in a Valetta court.

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ed/stb (Reuters, dpa, AFP)