“No plausible explanation has emerged for the bright red color of Mr. Brietbart after he was dead.”
FYI, cyanide poisoning will manifest itself in a bright red face. See extract of material below:
“The first symptoms of cyanide poisoning are rapid heartbeat, headache, and drowsiness - followed by coma, convulsions, and death. At this point the victim’s face is usually bright red as a result of the change in hemoglobin mentioned above. Since cyanide poisoning usually kills people in less than 15 minutes, immediate treatment is absolutely essential.”