Keith Hunter Jesperson

Wikipédia :
Keith Hunter Jesperson (born April 6, 1955) is a Canadian-born American serial killer known as the "Happy Face Killer" for the smiley face he drew on his many letters to the media and prosecutors. He had a violent and troubled childhood under a domineering, alcoholic father. Treated like an outcast by his own family and teased by other children for his large size at a young age, Jesperson was a lonely child who showed a propensity for torturing and killing animals. Despite consistently getting into trouble in his youth, including twice attempting to kill children who had crossed him, Jesperson graduated high school, secured a job as a truck driver, got married, and had three children. In 1990, after 15 years of marriage, Jesperson was divorced and saw his dream to become a Royal Canadian Mounted Policeman dashed following an injury. It was that year, after returning to truck driving, that Jesperson began to kill.

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His first known victim was Taunja Bennett on January 23, 1990,
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serial killer qui a démarré sa carrière par un premier meurtre à 34 ans et 10 mois (période critique septennale des 35 ans) le 23 janvier 1990 c'est à dire la veille de son jour critique émotionnel E1.

la période critique septennale est fréquemment présente lors du "démarrage" des tueurs : elle fait office de "déclencheur" de même que le jour critique émotionnel, parfois le jour critique physique.