How long before livor mortis sets in?

Answer:

Livor mortis starts 20 minutes to 3 hours after death and is congealed in the capillaries in 4 to 5 hours. Maximum lividity occurs within 6-12 hours. The blood pools into the interstitial tissues of the body

Thanks to wikipedia,
http://en.wikipedia.org/wiki/Livor_mortis

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