Suspect in the Lisa T. case: Investigators had previously targeted him

dpa | After the violent crime against the 13-year-old student Lisa from Marzahn and the discovery of her body in Brandenburg, the evaluation of traces continues. Public prosecutors had previously investigated the 22-year-old suspect for the acquisition and possession of child pornography.

How the girl died remains unclear. After an autopsy, further investigations were commissioned. The alleged perpetrator and the 13-year-old had not previously known each other, as the Berlin public prosecutor's office announced.

The man with German nationality was found on Sunday afternoon with a life-threatening gunshot wound in the same uninhabited house in Bad Freienwalde, Brandenburg, where the police also discovered the dead girl.

The suspect is being treated in intensive care, the public prosecutor's office said in a statement on Monday. Investigators have now searched his apartment in Marzahn-Hellersdorf. It was said that “potential evidence” had been secured.

The Berlin public prosecutor's office had been investigating him since January 2025 on suspicion of acquiring and possessing child pornographic content. This involves evaluating payments to a darknet platform. In March 2025, as part of an international week of action against child pornography, the man's living quarters were searched and data carriers were seized. “These are said to contain over 900 incriminated files that he is said to have obtained in 2023,” explained the public prosecutor’s office.

In addition, the Berlin judicial authority took over an investigation from the Passau public prosecutor's office in April of this year. It was said that a large number of suspected child pornographic content was also discovered on a cell phone belonging to the accused, who was in Bavaria at the time. The suspect does not have a criminal record.

Lisa's death made headlines across the country and sparked widespread sympathy. A murder commission from the Berlin State Criminal Police Office is investigating the course of the murder and the background to it. On Monday, emergency services continued to secure evidence at the site near the border with Poland.

It remains unclear when and how Lisa was brought to the house in a district of Bad Freienwalde around 50 kilometers northeast of Berlin. The 13-year-old left her family's apartment at around 7:15 a.m. on Tuesday last week to go to her school from a nearby bus stop. She didn't get there.

The police searched with hundreds of officers, sniffer dogs, a helicopter and an underwater drone. Ultimately, a tip-off about trespassing led to the police going to the empty house. There, officers discovered Lisa's body and the seriously injured suspect.