Estimating the number of serial killers that were never caught

Abstract

Many serial killers commit tens of murders. At the same time inter-murder intervals can be decades long. This suggests that some serial killers can die of an accident or a disease, having been never caught. We use the distribution of the killers by the number of murders, the distribution of the length of inter-murder intervals and USA life tables to estimate the number of the uncaught killers. The result is that in 20th century there were about seven of such killers. The most prolific of them likely committed over sixty murders.