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Reference.org
Post-mortem interval
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<p>The post-mortem interval (PMI) is the time that has elapsed since an individual's <a href="/facts/Death/VJmq29qm">death</a>. When the time of death is not known, the interval may be estimated, and so an approximate time of death established. Postmortem interval estimations can range from hours, to days or even years depending on the type of evidence present. There are standard medical and scientific techniques supporting such an estimation. </p>