The best replacement for killers is knight and day.

The best alternatives to killers are rated as following:
★★★★★  knight and day
★★★★  coldplay
★★★★  muse
★★★  mass murderers
★★★  gorillaz
★★★  bravery
★★★  cazzette
★★★  kings of leon
★★  fall out boy
★★  arctic monkeys
★  strokes
★  muscle relaxers
★  female serial killers
★  blood manor
★  corey hart
★  murderers
★  mass murders
★  killers
★  panic at the disco
★  computer programmers
★  gwen stefani
  men serial killers
  are we human
  white serial killers
  white killers
  male serial killers
  la roux
  clash
  black serial killers
  painkillers
  franz ferdinand
  mass killers

Your alternative for killers is not listed? Suggest!
Speaking about killers, one probably shouldn't forget about antisocial personality disorder.

Other search terms related to killers and their ratings are:
★★★★★ antisocial personality disorder
louis xiv
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Google Trends

Scale is based on the average worldwide traffic of killers in all years. Click on graph for more.
killers
knight and day
coldplay