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Postmortem changes constitute the natural progression of the body’s decomposition after death, beginning at the cellular level. The process involves complex cellular and biological phenomena. The changes that commence immediately after death continue to occur over a prolonged period at different rates for different organs. The onset and extent of these changes are affected by multiple intrinsic and extrinsic factors. The rates are not precise and differ from one geographical region to another and also differ in the same geographic region from one season to another. Understanding postmortem changes is essential for estimating the postmortem interval (PMI) or time since death, one of the primary objectives of the forensic autopsy. The timings of the appearance of the various postmortem changes mentioned in this brief overview of postmortem changes are only guidelines pertaining to tropical climates unless otherwise specified and should never be considered as absolute.

Forensic pathologists are essentially required to estimate the time since death (TSD) to assist in death investigation by limiting the investigation period and thus helping narrow down the number of suspects in homicide cases. TSD also provides valuable information in establishing the timeline of events that lead to death. This activity reviews the prevalent methods, including traditional and modern techniques, and the inherent shortcomings of the methods of estimation of time since death relates to the essential points needed by members of an interprofessional team managing the medico-legal investigation of death.