A court case involving the “Maschsee killer” in Germany is now headed to the Federal Court of Justice (BGH), after a new conviction with a 10-year prison term and subsequent security detention. A Düsseldorf court convicted a 38-year-old man of threatening, physically assaulting, and confining his former partner in her apartment in Düsseldorf. The court imposed a sentence of 10 years in prison, followed by security detention. The man’s defence filed a revision, which a court spokesperson confirmed was submitted on time. The revision matters because the regional court had gone beyond what the prosecution sought. The accused denied the allegations and his lawyer argued for an acquittal. In its reasoning, the court rejected the defence version that the case was the result of an alleged intrigue by an jealous former girlfriend. The presiding judge said the defendant was neither a victim of unlucky circumstances nor the target of an intrigue. A psychiatrist had classified the man as a dangerous “habitual offender” with a high risk of reoffending, which is why security detention was ordered. The case also reflects a prior conviction: in 2013, the man was sentenced to 12 years in prison for the murder of a sex worker in Hannover. Media at the time dubbed him the “Maschsee killer” after the victim’s body parts were thrown into the Maschsee. After being released from the murder sentence in 2025, the man built a community on TikTok and marketed the fact that he was a convicted female killer. The Düsseldorf court said many women were interested, including the later victim. The court described a pattern, saying that after problems linked to his alcohol consumption and his behavior at night, the man reacted violently. The latest stage is procedural: the revision will be examined by Germany’s highest court, the BGH.