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American banker John List murdered his wife, mother, and three children with a pair of handguns.

Related Wikipedia articles
John List (murderer)
American mass murderer (1925–2008)
John Emil List was an American mass murderer and long-time fugitive. On November 9, 1971, he killed his wife, mother, and three children in their Westfield, New Jersey home, then disappeared. He had planned the murders so meticulously that nearly a month passed before anyone…Source: Wikipedia (CC BY-SA)
November 9
Day of the year
November 9 is the 313th day of the year in the Gregorian calendar; 52 days remain until the end of the year.Source: Wikipedia (CC BY-SA)