Tsetska Tsacheva has denied any wrongdoing.
Bulgaria's security services were checking accounts held at a local bank, by a man who had several citizenships.
The possible new suspect is a Russian military intelligence officer known under the alias 'Sergey Fedotov'.
Plovdiv, Bulgaria's second city, whose origins date back to the 12th century BC, is known for its Thracian, Roman, Medieval, Ottoman and communist heritage.
Greece invited Bulgaria, Romania, and Serbia to meet on November 23 to discuss jointly hosting the 2030 World Cup.
Greek Prime Minister Alexis Tsipras said the four countries would discuss the possibility of becoming candidates for a major sporting event within 10 years.
The case shocked Bulgaria and drew strong international condemnation as observers suspected a possible connection between the crime and Marinova's work.
A 20-year-old Bulgarian suspect, named as Severin Krasimirov, was tracked down and arrested in the northern German town of Stade, near Hamburg, on Tuesday.
The 20-year-old suspect, who was arrested on Tuesday on a European warrant, had said during questioning that he did not want to kill the victim and denied raping her.
German police confirmed a 20-year-old man was arrested in the town of Stade near Hamburg on suspicion of raping, robbing and killing Marinova.
Marinova is the third journalist to be murdered in Europe this year after Jan Kuciak in Slovakia in February and Daphne Caruana Galizia in Malta in October 2017.
Andy Warhol's banana, Salvador Dali's clocks and Edvard Munch's "The Scream" are among the murals that have turned the village into a spectacular open-air gallery.
Greece, Bulgaria, Serbia, and Romania will work closer on energy and transport projects to better connect their economies.
The gathering, less than two weeks before the European Union's annual summit with China in Beijing, is unpopular in Brussels, which sees it as an attempt to divide the European Union.
The majority of Bulgarians are frequent scratchcard buyers.
Bulgaria is reviving plans to develop its Belene nuclear power plant and is open to Russian participation in the project.
Boyan Petrov had been attempting to scale Shishapangma.
The cash-strapped Bulgarian Weightlifting Federation has called upon former athletes to help raise money to pay a fine imposed by the International Weightlifting Federation for repeated doping violations.
Bulgaria's ruling GERB party withdrew the Istanbul Convention, which combats violence against women, from being ratified in parliament.
According to the environment ministry, there are around 800 brown bears in Bulgaria, one of Europe's largest populations of the protected species.
Around 70 horses were found dead, while those which were alive were in critical condition.
Erdogan had held a working dinner with European Union President Donald Tusk and European Commission chief Jean-Claude Juncker in Bulgaria with a litany of issues clouding their discussions.
A recent cold snap in Bulgaria has harmed many storks, but people have been coming to their rescue.
Energy Minister Temenuzhka Petkova tendered her resignation following media reports she was linked to the owners of solar energy producer Inercom.
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