Slovakian Prime Minister Robert Fico at a news conference on Wednesday.

Story highlights

Resignation follows weeks of protests over journalist's killing; Jan Kuciak reported on fraud among country's elite

Police are offering a reward of $1.2 million for information on the killer

CNN  — 

Slovak Prime Minister Robert Fico resigned Thursday after weeks of public protests over the slaying of an investigative journalist who reported on fraud among the country’s elite, including people connected to the governing party.

Fico announced his resignation during a ceremony in Bratislava.

The couple was found shot to death in Kuciak’s apartment in western Slovakia earlier this week.

Though the bodies were found February 26 at Kuciak’s apartment in Velká Mača, investigators believe the pair were shot sometime between February 22 and February 25, police said.

On March 1, Slovak police said they had detained seven people in connection with the killings. The people detained, who are between 26 and 62 years old, are believed to have ties to Italian organized crime, Police Corps President Tibor Gaspar said at a news conference that day, according to TASR.

Hundreds of candles were placed in front of a portrait of Slovak investigative journalist Jan Kuciak and his fiancée, Martina Kušnírová, in the center of Bratislava on February 27.

Kuciak, 27, and Martina Kušnírová were found dead Monday with bullet wounds to the chest and head, respectively, according to the International Press Institute. They were shot at Kuciak’s apartment in Velká Mača sometime between Thursday and Sunday, police said.

On Wednesday, published the last unfinished report Kuciak was working on before he was killed.

The report identified people settled in Slovakia who allegedly have connections to the Italian organized-crime group the ‘Ndrangheta. It also linked these people to high-profile Slovaks, including some connected to Smer.

The government of Slovakia said Monday it was offering a reward of 1 million euros ($1.2 million US) for information about the killing.

CNN’s Spencer Feingold, Sheena McKenzie and Ivana Kottasova contributed to this report.