Blood group analysis On 21 November, the results of Chikatilo's blood test again revealed his blood type to be type A and not type AB. Due to the amount of physical and circumstantial evidence investigators had thus far compiled, which indicated Chikatilo was indeed the murderer they had been pursuing, plus the fact that investigators had deduced the blood type of the murderer they had pursued using semen samples obtained from the clothing and bodies of fourteen of the victims as opposed to actual blood samples, investigators obtained a sample of Chikatilo's semen to test his blood type, the results of which confirmed that Chikatilo's semen was type AB, whereas his blood and saliva were type A.
Blood group analysis On 21 November the results of Chikatilo's blood test again revealed his blood type to be type A and not type AB Due to the amount of physical and circumstantial evidence investigators had thus far compiled which indicated Chikatilo was indeed the murderer they had been pursuing plus the fact that investigators had deduced the blood type of the murderer they had pursued using semen samples obtained from the clothing and bodies of fourteen of the victims as opposed to actual blood samples investigators obtained a sample of Chikatilo's semen to test his blood type the results of which confirmed that Chikatilo's semen was type AB whereas his blood and saliva were type A