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.
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
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Last verified: — sourced from The Movie Database. Machine-readable: Markdown · JSON.
Cast & crew
Top-billed cast in Key Witness.
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Key Witness — 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.
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