A dead body is having cadaveric lividity of bluish green colour. The most likely cause of death is by poisoning due to -
Hydrocyanic acid
Hydrogen sulphide
Ocleander
Sodium nitrite
Poison Color Nitrites Reddish brown Potassium chlorate Chocolate brown Phosphorus Dark brown Hydrogen sulphide Bluish green Cyanide Cherry red Carbon monoxide Pink Opium Blackish Ref: K.S.Narayan Reddy's Synopsis of Forensic Medicine and Toxicology, 29th edition, Chapter 35.
Poisoning