Viktoria Marinova, 30, was discovered in a park in Ruse, a town near the River Danube, on Saturday, Oct. 6.
Georgy Georgiev, Ruse regional prosecutor, added: "Her death was caused by blows to the head and suffocation, and her mobile phone, vehicle keys, glasses and some of her clothing were missing".
In comments carried by the Sofia-based news agency Focus, Marinov said that investigators would now be working to identify any "contacts and problems" she had before the murder.
Corruption-plagued European Union member Bulgaria found itself under pressure Monday to find the killer of a television journalist whose brutal murder at the weekend has shocked the country and sparked global condemnation.
The European Commission has urged the Bulgarian authorities to bring to justice those responsible for the killing.
Marinova had recently launched her own news talk show called "Detector". "In no way, under any form, never have we received any threats - aimed at her or the television", a journalist from TVN told AFP under condition of anonymity, adding that he and his colleagues feared for their safety.
The Center for the Study of Democracy, based in the capital, Sofia, outlined in a report a year ago a portrait of a state so riddled with graft that 1 in 5 adults, or 1.3 million people, were thought to have taken part in a corrupt transaction, such as paying or receiving a bribe.
Marinova was a presenter with the TVN broadcaster for the show "Detektor". "It was meant to serve as an example, something like a warning", Yordanov added.
A candlelight vigil in Marinova's memory is organised for Monday evening in Sofia.
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The prosecutor general, Sotir Tsatsarov, told reporters in Ruse on Monday that nothing would be ruled out, but he also said that it was unlikely the killing was connected to her work.
As The Guardian noted, Bulgaria was ranked 111 of 180 countries in this year's Reporters Without Borders world press freedom index.
They both appealed to Bulgarian authorities to catch Marinova's killers and shed light on what happened.
A suspect in the rape and killing of a Bulgarian television journalist whose work highlighted corruption in the East European country has been arrested in Germany, officials said Wednesday.
The Organization for Security and Cooperation in Europe, an intergovernmental organization, called for a "thorough investigation" of her rape and murder, noting "a trend of increased attacks against female journalists". The Balkan nation, which joined the European Union in 2007, was ranked 71st on Transparency International's corruption list a year ago.
"In the last six years, it's been an incredibly risky time to be a journalist", says Robert Mahoney the Committee to Protect Journalists (CPJ) deputy executive director.
In a July report on the state of media freedom in Bulgaria, Reporters Without Borders said, "Fortunately, no investigative journalists have been killed in Bulgaria for their work, but there are documented murder plans and attempts, cruel, execution-style, beatings, auto arson and bombs targeting investigative reporters".