Those Who Kill is a Danish crime TV series from 2011, which follows a fictitious unit within Copenhagen Police which specialises in investigating serial murders. The series was aired as five two-part stories in Denmark, but has aired as five feature-length episodes in most other countries. A separate 92 minutes feature film, Fortidens skygge, which forms a continuation and ending of the series, premiered in Danish cinemas on 15 March 2012, and is being aired as the final episode or episodes of the series in many other countries, such as the UK and Germany.