Police and prosecutors said they were working on three possible motives - whether Marinova was a victim of a random attack by a person with a mental disorder, a planned attack or whether the crime was linked to her personal life.
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". Attila Biro, editor of the Romanian investigative website Rise Project, and Dimitar Stoyanov, of the Bulgarian site Bivol, were arrested in the Sofia suburb of Pernik on 14 September and held for six hours.
The organization added in its statement that Marinova's last broadcast was an interview with Romanian journalist Attila Biro and a Bulgarian colleague, Dimitar Stoyanov, who were looking into allegations of fraud involving European Union funds, and that the two reporters were detained by Bulgarian police in September. Her death follows the alleged slaying of a Washington Post journalist in the Saudi consulate in Istanbul. "This is a topic on which no other Bulgarian national media dared to report on".
Marinova's killing was widely-condemned on Twitter by fellow journalists and watchdog groups. A German Foreign Ministry spokesman said that it's imperative "that there's a fast investigation and that this frightful event will be illuminated as comprehensively as possible".
"I strongly hope that the truth will soon be uncovered, her perpetrator or perpetrators found and justly punished", Teodora Shopova said after lighting a candle at the vigil.
The Committee to Protect Journalists demanded a "rigorous, thorough investigation" and added that the committee is shocked by the murder. She had reported on alleged corruption by tycoons and politicians in an episode of his programme called Detector for TVN.
Sven Giegold, a German member of the Greens in the European Parliament, said all of Europe should worry about the killing.
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Europe has seen the steepest decline in World Press Freedom Index regional rankings over the past year: Malta is now ranked 65th, down by 18 points, and Slovakia 27th, down by 10.
Recall, 30-year-old woman killed in the city of Rousse (the fifth largest city in Bulgaria).
Ms Marinova is the third European journalist to be killed in the past year. Her body was found in a park near the river.
Mladen Marinov, Bulgaria's interior minister, described the murder as "exceptionally brutal", according to local news outlets.
The Interior Ministry said late Monday that prosecutors had opened an investigation into GP Group, a large private Bulgarian building company alleged to have misused the European Union money, and froze 14 million euros ($16 million) of its assets.
"The best criminologists were sent to Ruse, let's not press them", Borisov said.
Marinova was a director of a small local TV station and presenter of two investigative programs.