German doctor faces trial for 15 lethal injection murders in Berlin, Germany

A 40-year-old doctor, identified as Johannes M. and dubbed “Doctor Death” by the German press, began his trial on Monday (14) in Berlin, accused of murdering 15 patients under his care between September 2021 and July 2024. He allegedly administered lethal injections with a cocktail of sedatives and muscle relaxants, without the victims’ consent, causing death by respiratory failure. In five cases, the doctor set fire to the victims’ homes to cover up the crimes. The Berlin Prosecutor’s Office is seeking a life sentence and is investigating 96 additional suspicious deaths, including that of the doctor’s mother-in-law. The trial, which could reveal Johannes as one of Germany’s most prolific serial killers, is scheduled to last until January 2026.

The case has shocked the German capital and raised questions about safety in palliative care services. Johannes M., who worked in a home care team, exploited the trust placed in his profession to commit the crimes. The investigation began after a colleague alerted police to suspicious deaths linked to fires.

• Crimes committed: 15 confirmed murders, with lethal injections and fires in five cases.
• Crime period: Between September 2021 and July 2024, in Berlin.
• Ongoing investigation: 96 additional deaths under review, including the doctor’s mother-in-law.
• Requested punishment: Life imprisonment without parole.

Start of investigations and reports

The investigation against Johannes M. began in July 2024, when a colleague from the palliative care team, where the doctor had worked since January of that year, noticed a disturbing pattern: several patient deaths associated with fires in their homes. The alert led the Berlin Criminal Police to open an inquiry, resulting in the doctor’s arrest on August 6 at Frankfurt airport upon returning from vacation. Initially, he was charged with four murders, but the number rose to 15 as investigations progressed. The Prosecutor’s Office reviewed 395 cases, confirming suspicions in 95, and plans five additional exhumations to clarify other deaths. The case of the doctor’s mother-in-law, who died during a medical visit, is also under investigation.

The Public Prosecutor’s Office noted that the victims, aged between 25 and 94, were not terminally ill, ruling out any euthanasia justification. Johannes M. allegedly acted without apparent motive beyond a possible compulsion to kill, according to prosecutor Philipp Meyhöfer.

Accused’s modus operandi

Johannes M. used a cruel and calculated method to commit the murders. He administered a lethal cocktail of anesthetics and muscle relaxants, paralyzing the respiratory muscles and causing death within minutes. In five cases, he set fire to the victims’ homes to cover up the crimes. One of the most shocking incidents occurred on July 8, 2024, when he killed two patients in a single day, one in the morning and another in the afternoon, showing a chilling coldness that stunned investigators.

• Lethal method: Combination of sedatives and muscle relaxants without consent.
• Cover-up: Arson in five victims’ residences.
• Victim profile: 12 women and three men, aged 25 to 94.
• Lack of motive: Prosecutors claim the doctor acted out of a desire to kill.

The use of fires to conceal the murders drew authorities’ attention, as the unusual pattern of deaths in similar circumstances raised suspicions. Toxicological analysis of exhumed bodies confirmed the presence of lethal substances, strengthening the charges against the doctor.

Profile of Johannes M. and his doctoral thesis

Johannes M., described as a reserved professional, married, and father of one, graduated in medicine and presented a doctoral thesis in 2013 titled “Homicides in Frankfurt am Main: An Overview from 1945 to 2008.” The 117-page work began with the question: “Why do people kill?” and was dedicated to victims and their families. The irony of his research, which explored the psychology and motives behind murders, became a focal point in German media coverage, earning him the “Doctor Death” nickname.

During the first day of the trial, Johannes remained silent, only confirming his personal details. He refused a prior psychiatric evaluation, leading the court to appoint an expert to observe his behavior during hearings. His lawyer, Christoph Stoll, stated that the defendant will not make statements for now, adding to the mystery surrounding his motivations.

Parallels with other cases in Germany

The case of Johannes M. is not unique in Germany’s recent history. It recalls nurse Niels Högel, sentenced in 2019 to life imprisonment for murdering 85 patients between 2000 and 2005 with lethal injections, aiming to stand out by attempting to resuscitate them. Högel, considered the country’s worst serial killer, shocked the world with the scale of his crimes. Prosecutors fear that, if the 96 suspicious deaths are confirmed, Johannes M. could surpass this number, becoming Germany’s most notorious serial killer.

• Niels Högel: Convicted of 85 murders in German hospitals.
• Similar method: Use of lethal injections to cause cardiac arrests.
• Profile difference: Johannes operated in palliative care, not hospitals.
• Potential scale: 96 additional cases could elevate Johannes to the top of the list.

The similarities between the cases have sparked debates about the need for greater oversight in healthcare services, particularly in palliative care, where trust in professionals is paramount.

Impact on families and society

The trial, set to continue until January 28, 2026, with 35 scheduled hearings, has mobilized German society. Around 150 witnesses, including 13 victims’ relatives, are expected to testify at the Berlin Regional Court. The mother of a 25-year-old victim, the youngest killed, was visibly emotional during the reading of the charges, highlighting the devastating impact of the crimes. Prosecutors emphasized that Johannes abused the trust placed in him as a doctor, visiting patients under the guise of providing care while planning the murders.

The Berlin community, especially those relying on palliative care services, now faces a climate of distrust. Authorities have promised to review safety protocols and oversight in home medical services to prevent future cases.

Trial timeline and next steps

The Berlin Regional Court has structured the process to ensure a thorough analysis of the 15 confirmed cases. Hearings, which began on July 14, 2025, include testimonies from witnesses, experts, and relatives, with an expected conclusion in January 2026. Meanwhile, the investigation into the 96 suspicious deaths continues, with exhumations planned to clarify possible connections to Johannes M.

• Trial duration: Until January 28, 2026, with 35 hearings.
• Witnesses: Around 150 people, including 13 victims’ relatives.
• Planned exhumations: Five bodies to be analyzed in separate proceedings.
• Intended punishment: Life imprisonment and revocation of medical license.

The Prosecutor’s Office seeks a conviction for aggravated murder, which prevents parole after 15 years, a penalty reserved for cases of extreme severity in Germany. The permanent revocation of Johannes’s medical license is also a priority to prevent him from practicing again.

Reactions in the medical community

Berlin’s medical community expressed shock and concern over the case. Palliative care professionals, a field requiring high trust between patients and doctors, fear the sector’s reputation will be tarnished. German medical associations announced plans to review ethical guidelines and implement additional training to identify suspicious behavior in healthcare professionals.

The case also reignited discussions about the mental health of doctors and nurses, with experts suggesting that the stress and pressure of palliative care work could, in extreme cases, lead to deviant behavior. However, prosecutors reiterate that Johannes’s crimes are unrelated to professional pressures, stemming instead from a deliberate intent to kill.