You can watch Chasing a Killer: Gary Allen on Prime Video in the UK and Ireland, where it is available as a two-part true crime documentary.

Quick Scoop

  • Primary platform: Prime Video (streaming).
  • Regions confirmed: UK and Ireland.
  • Format: Two episodes, about 45–46 minutes each.
  • Release timing: Released on Prime Video around 22 February 2026.

Any other platforms?

  • It also appears in Apple TV’s catalogue , but that listing is for viewing via the Prime Video channel integration rather than a separate standalone streamer.
  • There is currently no clear indication it’s widely available on other major services (like Netflix) as of February 2026; coverage consistently points to Prime Video as the home.

What the documentary covers (brief)

  • Focuses on the murders of Samantha Class (1997) and Alena Grlakova (2018), and how detectives linked both cases to Gary Allen after an earlier acquittal.
  • Emphasizes the double jeopardy aspect and the long investigation by South Yorkshire and Humberside Police.

Bottom note: Information gathered from public forums or data available on the internet and portrayed here.