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Stages of Death

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Stages of Death
IND 105 Crime Scene Investigation
Anne Marie Brnardic
April 12, 2013

Estimating the time of death is critical to any crime scene cases. The different stages of death can be very important especially when you find a body that has been dead for days. Knowing the stages of death gives a good determination of when a crime was committed. When finding a body or crime, there are normally two different known points for when determining a crime, that is to find the time the body was found and to figure out the last time that person were actually known to still be living. (M. Lee Goff. 2010) As soon as death occurs, there are different changes that the body goes through to change it. When this happens, it can effect a the physical makeup and image of the body before the decomposition changes occur. (M. Lee Goff. 2010)
There are many stages of death that someone can go through that can happen relatively fast. The three early postmortem changes of death are called Algor Mortis, Rigor Mortis, and Livor Mortis. Each of these stages affect the body differently that cause certain actions to occur on the body after post mortem starts to happen. Algor Mortis is the state when death has happened and the body stops the regulation of its normal temperature. This means the normal temperature of the body begins to cool until the entire body is cooled to a non-existent temperature. This can take place right away and last up to 18 hours. (M. Lee Goff. 2010) Rigor Mortis is the state of death when a chemical change happens in the body, which causes the muscles to stiffen and make changes in the myofibrils of the muscle tissues. Rigor Mortis can be first noticed within 2-6 hours following the occurrence of death. This state can last 24 to 84 hours after it started and last until the muscles begin to relax. (M. Lee Goff. 2010) Livor Mortis is a physical process the body goes through. When death happens, circulation of the blood stops and starts to settle to the lowest point on the body if on an object or surface. The body ends up having discoloration with the part of the body that is closest to a point of contact. This state can happen one hour after death. (M. Lee Goff. 2010)
Other stages of death can be ones like Tache Noir, which is something that can happen to the eyes if they remained open and exposed. If part of the cornea were exposed then it would cause the eye to dry out and leave a greenish or black discoloration. Another effect that can happen to the body is Greenish Discoloration or Marbling of the skin. Greenish Discoloration is when the gases that are produced in the abdomen are spread out in the body that causes a greenish coloring in the blood vessels and other areas of the body. Marbling creates a purple to greenish discoloration. This is sometimes known to present itself similar to a mosaic appearance such as a cracking design. Skin slippage is also common upon death.
In a moist or wet environment, skin slippage can cause the skin to separate and disconnect. However, if this happens, the fingerprints of the skin are still clear enough to get fingerprints if needed. Mummification can happen in a dry climate, whether it is extremely hot or extremely cold in this type of situation. The skin can begin to look to have a leathery appearance, which allows the body to last in its normal looking state for long periods of time, especially with very little change from the temperatures of the weather. Saponification is said to be when the tissues take on a waxy look to them, also having a consistency of the waxy feeling from being submerged or floating in water.
(M. Lee Goff. 2010)

Decomposition is a process that does not stop, starting with the point at which the death occurred and ending when the body has been skeletonized. (M. Lee Goff. 2010) Human decomposition is very quick and begins roughly four minutes after death. This happens because carbon dioxide in the blood increases, pH decreases, the cells of the body are starved from oxygen, and wastes accumulates, which poisons the cells with their toxins. (Arpad A. Vass, Stacy-Ann Barshick, Gary Sega, John Caton, James T. Skeen, Jennifer C. Love, and Jennifer A., Synstelien. 2002) After the decomposition starts, the body has now moved into the ambient temperature known as Algor Mortis. Also resulting in the blood settling in the body to cause discoloration of the skin known as Livor Mortis. Lastly the cytoplasm has gelled together because of the increased acidic in the body known as Rigor Mortis. (E. C. Bate-Smith, J. R. Bendall) At this point, putrefaction can take place. Putrefaction is known as destroying the soft tissues of the body by the action of microorganisms. From the bacteria, fungi, and protozoa, it results in the destructiveness of tissue into gases, liquids, and simple molecules. (Arpad A. Vass, Stacy-Ann Barshick, Gary Sega, John Caton, James T. Skeen, Jennifer C. Love, and Jennifer A., Synstelien. 2002) Bacteria, Fungi, and Molds can also be a good determination to tell when death took place. While alive, your body fights of bacteria all the time. You can get bacteria from any place or at any time. When the human dies, it is hard for the body to keep bacteria in the place it is supposed to be, for example the kidneys. Shortly after death, the body cannot fight off the bacteria anymore, which is where the bacteria start to take over, beginning with the inside out. (M. Lee Goff. 2010)

The skin can say a lot about an incident especially if it gives away clues about the time and method of killing or trauma. The body can have postmortem damage caused by species activity. You can find different activity by noticing feces on the body or anything else left behind near the body. You might also be able to tell what happened by any lacerations or bite marks that were left from an animal. (Kalpana Reddy and Eve J. Lowenstein 2011)

Another way to tell how long the body has been dead is by using the insect activity to determine the time of death. Different insects are attracted to the body at different times after death. This time period of insect activity will show the most recent time of death since it occurred, which can help determine the correct time of death. (M. Lee Goff. 2010) After decomposition starts, the insects feed on the body from the time the person died. There are different insects that can be attracted to the body thorough different stages the body goes through. For example, some insects could be the true flies (Diptera), blow flies (Calliphoridae), or flesh flies (Sarcophagidae), which are normally the early invaders. (Barbara Winter. 2010) The longer the body is exposed, the more it will attract other insects such as spiders, centipedes, and millipedes. There are many ways insects can be used to help solve a crime or estimate the time since death.

We are discovering faster and easier ways to determine death. With the technology we have today, we are able to narrow down the time of the crime and where it took place based on the remains of a body. Knowing the different stages of death can be very important at any moment. Working in this type of atmosphere is not always pleasing. You have no choice but to work with what you have, but in the end you find out it might just be exactly what you needed to solve a crime.

Sources

Arpad A. Vass, Stacy-Ann Barshick, Gary Sega, John Caton, James T. Skeen, Jennifer C. Love, and Jennifer A., Synstelien. 2002. Decomposition Chemistry of Human Remains: A New Methodology for Determining the Postmortem Interval. Page 542-553

Dr. Barbara Winter Simon Fraser University. 2010. Forensic Entomology of the Use of Insects in Death Investigations. Online Journal article
E. C. Bate-Smith, J. R. Bendall. December. Factors determining the time course of rigor mortis. The Journal of Physiology Pages 47-65

Kalpana Reddy and Eve J. Lowenstein. May 2011. Forensics in dermatology: Part 1 Journal of the American Academy of Dermatology Volume 64, Issue 5 Pages 801-808

M. Lee Goff. 2010. Early Postmortem Changes and Stages of Decomposition. Current Concepts in Forensic Entomology Pages 1- 23

M. Sinha, S. Lalwani, R. Mir, S. Sharma, T.D. Dogra, T.P. Singh. October- December 2012. A Preliminary Molecular Study on Protein Profile of Vital Organs: A New Direction for Post Mortem Interval Determination. J Indian Acad Forensic Med Volume:34, Number 4 292-294

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