Timeline of<unk><unk>  changes. Figure 1.<unk><unk>  phenomena to estimate the time of death. The<unk>  <unk>  is the time that has elapsed since an individual's death. When the time of death is not known, the<unk>  may be estimated, and so an approximate time of death established.<unk>  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.
Post-mortem interval
Cause of death
Head injury criterion
Blood type
Pregnancy category
Infant Mortality Rate
Disease cluster
History of virology