January 2, 1942 - Gen Sekine
Sekine operated through the mundane cover of a dog-breeding business, using the trust of ordinary commercial transactions to target and kill at least four clients over the span of a few months. The crimes were committed in partnership with his common-law wife, and the case drew significant attention in Japan both for the calculated exploitation of that trust and for the swift succession of killings within a single year.
From Wikipedia
Gen Sekine (関根元, Sekine Gen; 2 January 1942 – 27 March 2017) was a Japanese dog breeder and serial killer who, together with his common-law wife Hiroko Kazama (風間博子), murdered at least four clients in Kumagaya, Saitama Prefecture, between April and August 1993. Both were sentenced to death for their crimes, but Sekine died on death row prior to execution.
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