Serial murder investigations are usually broken from outside: a survivor, a DNA hit, a traffic stop. Seven cases in this archive were broken from inside the family. Someone who lived with the killer, or was related to the victim, worked out what had happened and went to the police.
April Balascio came to suspect her father, Edward Wayne Edwards, of two murders committed in Wisconsin in 1980. She went to the police in 2009. He was convicted the following year, and when Wisconsin sentenced him to life he wrote to Ohio prosecutors confessing to a further murder specifically in order to be sentenced to death.
That is the version people expect: a relative recognizing something and acting on it, decades late, at obvious personal cost.
Three of the seven are the other kind. The person who went to the police was not related to the killer but to the victim, and they went because nobody else was going to.
Camille Cleroux's case turned on a son who came to the building where his mother lived, found a stranger living in her apartment and her furniture gone, and went to the police. Neither of the women Cleroux killed had been reported missing, he had forged letters in their names for years to keep it that way.
Margaret Waters was caught in June 1870 when a young man tracing his sister's baby went to the police. Sergeant Richard Relf followed the newspaper advertisements to the house and found eleven infants inside, five of them dying. That single visit is the origin of the Infant Life Protection Act.
Thomas Lee Dillon's case moved after Jamie Paxton's mother published an open letter in the local newspaper addressed to her son's killer. He replied to it. A friend of Dillon's separately told police about his habit of shooting at things from his car, and the two together made the case.
The remaining three are the uncomfortable ones, because the informant was closest of all.
Trevor Joseph Hardy was arrested in Manchester in 1976 after his girlfriend and his brother both gave information to the police. He confessed and was given three life sentences with a recommendation that he never be released, and he died at Wakefield in 2012 without being released.
Johann Otto Hoch married Marie Walcker in Chicago in December 1904. She died within weeks, and he immediately proposed to her sister. The sister went to the police when he asked her for money. He was hanged in 1906.
Peter Kurten was arrested after his wife turned him in, on his own instruction. He had told her what he had done and told her to collect the reward. He was convicted of nine murders and guillotined in 1931.
Read the seven together and the pattern is not really about loyalty being overcome. It is about who was in a position to notice.
In every case the information that mattered was ordinary and domestic: a daughter's memory of where the family lived in 1980, a son noticing his mother's furniture was gone, a young man asking what had become of his sister's baby. None of it was detective work. All of it required somebody to decide that a suspicion about a person they knew was worth taking to a police station.
The Kurten case is the exception that proves how narrow that decision usually is. His wife did not work anything out and did not have to weigh anything up. He handed it to her.