# Where to watch Key Witness (2021) in the UK

> Key Witness (2021) is available to watch free in the UK on Plex and Tubi TV. Last verified on 12 May 2026 by ScreenSearch.

**Type:** TV series  
**Year:** 2021  
**Runtime:** 45 minutes per episode  
**Genres:** Drama, Crime  
**Seasons:** 1  
**Region:** United Kingdom (GB)  
**Last verified:** 12 May 2026 (2026-05-12T02:44:33.303Z)  

## Synopsis

A bond is formed between a doctor who cannot save lives, a policewoman who cannot catch criminals and an assassin who cannot kill, but can they solve crimes?

Failing to protect a key witness to an international drug smuggling case, Interpol Officer Xu Guo Ying (Denise Camillia Tan) resigned as a result. She meets funeral planner Wang Yu Xuan (Sheryl Ang) and arcade staff Chen Zhi Ming (Desmond Tan), together the trio form a team that specializes in the search for key witnesses in unsolved cases. They soon forged a strong friendship but each is not what they appear to be. As their past catches up with them, it threatens to destroy them. A doctor who cannot save lives, a policewoman who cannot catch criminals, and an assassin who cannot kill, how will their lives unfold? Can they leave their past behind and persevere in seeking the truth?

## Streaming options in the United Kingdom

### Free (with ads or TV licence)

- [Plex](https://www.themoviedb.org/tv/135557/watch?locale=GB)
- [Tubi TV](https://tubitv.com/search/Key%20Witness)

## Frequently asked questions

**Where can I watch Key Witness for free in the UK?**

Key Witness (2021) is available free (with adverts or a TV licence) on Plex and Tubi TV in the United Kingdom.

**Are all seasons of Key Witness on the same service?**

Not always — TV licensing is sometimes negotiated season by season. ScreenSearch shows availability across all seasons on the title's page; for season-specific availability, look at the season picker inside the search dialog.

**Is Key Witness on Netflix, Disney+ or Amazon Prime Video in the UK?**

Key Witness is not currently included with any major UK subscription service. It may still be available to rent or buy.

**How accurate is this TV series's availability data?**

Availability is sourced from The Movie Database (TMDB), which in turn pulls from JustWatch. Listings are refreshed daily. For purchase decisions, the provider's own site is the source of truth.

## Sources

- Streaming availability: The Movie Database (TMDB), refreshed daily.
- Underlying licensing data: JustWatch.
- Canonical URL: https://www.screensearch.co.uk/watch/tv/135557/key-witness-2021
- Poster image: https://image.tmdb.org/t/p/w500/1OsATRq6hBOygC5xTduqg6edn53.jpg
- JSON variant: https://www.screensearch.co.uk/watch/tv/135557/key-witness-2021.json

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Generated by [ScreenSearch](https://www.screensearch.co.uk/) — a free UK-focused tool that answers "where can I watch this in the UK?" for any film or TV show. No accounts, no signup.