In the UK, BBC Four started broadcasting season 1 as "Darkness: Those Who Kill" on 31 August 2019. Season 2 was broadcast on BBC Four in the UK in May 2021 as "Blinded: Those Who Kill." Season 3 was broadcast on BBC Four in the UK as "Lost: Those Who Kill," starting on 8 April 2023. Season 4 was broadcast on BBC Four in the UK as "Justice: Those Who Kill," starting on 26 October 2024.
Those Who Kill (Danish: Den Som Dræber), distributed as Darkness: La huella del crimen (2019) (Danish: Den som dræber - Fanget af mørket) in some regions, is a Danish crime thriller TV series produced by Miso Film and Viaplay/Nordic Entertainment Group and created by Ina Bruhn. The series is about criminal profiler Louise Bergstein's (Natalie Madueño) attempts to link unsolved murders. The series is a reboot of the crime thriller of the same name that was created by Elsebeth Egholm and aired on TV 2 in 2011. The second season has been sub-titled Blinded: Those Who Kill in some regions, and the third series has been sub-titled Lost: Those Who Kill.