Timeline of occurences after death

First Hour

Immediately after death, all muscles in the body would relax. This is also known as primary flaccidity. In addition, the jaws may be hung open, the eyelids would relax, the joints and limbs would become flexible and the pupils would enlarge. Since the muscles are relaxed, the skin would be saggy. Joints and bones, like the hips, becomes noticeable. Since the heart has stopped beating, the circulation of blood will stop too, causing a person to become pale. This process is also known as pallor mortis. Next, algor mortis, the decrease of body temperature after death, takes place.

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Second- Sixth Hour

Now, livor mortis, a process whereby blood flows to the areas of the body nearer the ground due to gravity, occurs. Around the third hour of death, all the muscles in the body stiffen. This process is rigor mortis. It starts from the eyelids, neck and jaw to the toes and fingers. However, in deaths of younger children and infants, rigor mortis might not occur as they have fewer muscles in their body.

Seventh- Twelfth Hour 
Rigor mortis would be at its maximum 12 hours after death. However, this is dependent on the deceased's gender, age, physical condition, the temperature and so on. During this period of time, it would be hard for the limbs to be moved. The toes and fingers may be crooked while the elbows and knees would be slightly bent.

After Twelve Hours

After reaching the peak of rigor mortis, the muscles would relax as chemical changes within the cells takes place and there is tissue decay. However, this process is gradual, occurring over a few days. The external conditions include the factor on the speed of the process. All the muscles will relax again, from the toes and fingers to the jaws, eyelids and neck. This would be known as secondary flaccidity.

http://dying.about.com/od/thedyingprocess/a/My_Body_Postmortem.htm