Solving a cold case through scientific evidence

Area of Science:

• Forensic Pathology
• Neuropathology

Background:

• A case involving a homeless man's death in the late 1990s was initially attributed to meningoencephalitis.
• Initial forensic autopsy findings excluded assault as a cause of death, and the case was suspended.

Purpose of the Study:

• To re-evaluate the cause of death using advanced methodologies.
• To demonstrate the importance of rigorous methodological approaches in forensic science.

Main Methods:

• Reanalysis of histological samples from the brain.
• Macro- and microscopic examination of formalin-preserved brain tissue.
• Immunohistochemical analysis using CD15 antibody.

Main Results:

• Reanalysis confirmed subarachnoid and intraparenchymal hemorrhages with leukocytic infiltration.
• Immunohistochemistry localized leukocytes to hemorrhagic areas, excluding widespread meningoencephalitis.
• The cause of death was redefined as traumatic subarachnoid hemorrhage.

Conclusions:

• Rigorous, evidence-based methodology is crucial for establishing scientific evidence in forensic cases.
• Advanced techniques like immunohistochemistry enable accurate cause-of-death determination, even years later.
• Multidisciplinary collaboration enhances the reliability of forensic investigations.