Chapter 5: Death Investigation & Autopsy Basics

Death Investigation & Autopsy Basics delineates the differences between clinical and forensic autopsies, explaining how the latter emphasizes external findings, scene correlation, and the collection of physical evidence such as clothing, fingernail scrapings, and DNA swabs. The text explores various causes of death, including blunt-force trauma (characterized by abrasions, contusions, and lacerations), sharp-force injuries (distinguishing cuts from stabs and identifying defensive wounds), and asphyxia, where petechiae and hyoid bone fractures serve as key indicators in strangulation or hanging cases. Gunshot wounds are analyzed regarding entrance and exit characteristics, stippling, and tattooing to estimate firing range. The chapter details the five manners of death—homicide, suicide, accidental, natural, and undetermined—and the complexities involved in certifying them. To estimate the time of death, or postmortem interval (PMI), the summary covers physiological processes such as algor mortis (cooling), livor mortis (blood settling), and rigor mortis (muscle stiffening), alongside ocular potassium analysis and the stages of decomposition like autolysis, putrefaction, and the formation of adipocere. Additionally, the roles of forensic specialists are highlighted: forensic anthropologists identify skeletal remains by analyzing pelvic and cranial features to determine sex (noting differences like subpubic angles being (greater than) 90 degrees in females), age, ancestry, and height, while forensic entomologists use insect succession and blowfly larval development to establish timelines for decomposition.