The following quote is taken from Alan Gunn, Essential Forensic Biology, 2nd edition, Wiley-Blackwell, New York 2009, pp. 20-22 (italics mine):

«Sometimes the cause of death may result in striking changes to normal skin coloration. For example, deaths from carbon monoxide poisoning often result in a cherry red / pink coloration to the skin, lips and internal body organs (…) although if the body is not discovered until several hours after death the coloration may not be immediately apparent owing to the settling of the blood to the dependent regions [livor mortis].

Carbon monoxide gas forms during the combustion of many substances and poisoning is a common feature of accidental deaths in which people are exposed to fumes from a faulty gas boiler or during fires and suicides in which the victim breaths in vehicle exhaust fumes. (…) Carbon monoxide has much greater affinity than oxygen for the haeme molecule of haemoglobin and therefore, even at very low atmospheric concentrations it will rapidly replace it and thereby reduce the oxygen carrying capacity of the blood. When carbon monoxide binds with haemoglobin in the blood or myoglobin in the muscles it forms carboxyhaemoglobin and carboxymyoglobin respectively and they are responsible for the pink coloration

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