Krivitsky was naming persons who had been assassinated and said he could prove that many peculiar deaths were bona fide assassinations. He indicated that many assassins were medical personnel which allowed for the deaths being attributed to natural causes. Krivitsky claimed that the assassins used a complete series of chemicals that produced symptoms of liver, heart, and kidney failure, and cancer, leukemia or blood cell diseases.
Krivitsky was assassinated on February 10, 1941, by a bullet to the head in the Hotel Bellevue in Washington, D.C. Krivitsky was scheduled to testify the next day before the New York legislative committee investigating the states educational systems.