multimurder

multi- +‎ murder

multimurder (not comparable)

1. Involving more than one murder.
   • 2014, James O'Callaghan, Manila Gold:

     Sergeant Vincensio Mahero once again received a call to view a multimurder scene that indicated it to be a professional execution, possibly of a political nature.

multimurder (countable and uncountable, plural multimurders)

1. Multiple murders, especially when committed by a single killer.
   • 1973, United States. Congress. House. Select Committee on Crime, Street Crime in America, page 420:

     Before firing a shot, an officer must consider the fact that regardless of what a man has done—multimurder or what have you—the State of Michigan has no capital punishment.

   • 1980, William Aiken, Hugh LaFollette, Whose child?, page 44:

     The macabre multimurders and the trial that convicted Manson commanded national media attention.

   • 2016, Laurence A. Rickels, The Psycho Records, page 103:

     That the structure of collection folding out of or into multimurder was not neutral but hellbent on extending torment beyond the grave, rests its case.