Futoshi Matsunaga (?? ?, Matsunaga Futoshi, born April 28, 1961) is a Japanese serial killer who both defrauded and tortured his victims in what is collectively known as the Kitakyushu Serial Murder Incident (?????????).
Matsunaga was convicted of six counts of murder and one count of manslaughter between 1996 and 1998 and sentenced to die by hanging.
He murdered his victims with an accomplice, Junko Ogata, who received a life sentence.
Matsunaga's crimes were so atrocious that most Japanese media were not willing to report the details.
The Japan Times reported that prosecutors said "[the case] is without comparison in the criminal history of our country".
Several writers, including Ryuzo Saki, published the details of the crimes.