Darya Trepova was taken into custody in St Petersburg and was brought to court in Moscow on Tuesday, where prosecutors asked the court for her to remain in detention.
Tatarsky, who was attending an event in a café, was killed in a blast on Sunday, while over 30 people were injured. According to the authorities, Trepova admitted in a video that she brought a statuette to the café, which later exploded, but she didn’t know that it would explode, nor did she admit any further role.