TV Show50%

Expert Witness

DocumentaryCrime

This dramatic true crime series reveals how some of the UK’s most serious and complex cases were solved by the expertise of a band of unsung heroes – the expert witnesses.

Oct 25, 20215 seasons75 episodesReturning SeriesEN

Start Watching

Cast spotlight

Jump into full cast pages for bio, socials, and recent work.

Ashley John-Baptiste

Self - Presenter

View profile

Seasons

Series 1

15 episodes

Premiered Oct 25, 2021

Series 2

15 episodes

Premiered Nov 14, 2022

Series 3

15 episodes

Premiered Aug 21, 2023

Series 4

15 episodes

Premiered Oct 28, 2024

Series 5

15 episodes

Premiered Jul 6, 2026

Episodes

1–6 of 15

No preview

Ep 1

Soil and Insects

Oct 25, 2021

29m

Soil analysis helps solve a 37-year-old murder investigation in Scotland. In Huddersfield, analysis of insect life on a body found on the moors helps detectives catch a killer.

No preview

Ep 2

Blood Under Paint and Gait

Oct 26, 2021

29m

Blood traces hidden under paint allow an expert witness to find a killer and free five men from suspicion. An unusual gait identifies the murderer of an office worker.

No preview

Ep 3

Forensic Imaging and MSN Chat

Oct 27, 2021

29m

Marks left by the tread of a shoe help detectives catch a killer terrorising Rochdale, and a forensic linguist deciphers messages written in slang, revealing a murder plot.

No preview

Ep 4

Fibre Trails and Diamonds

Oct 28, 2021

29m

A team of expert witnesses follow a trail of fibres and DNA to solve three cold cases in Pembrokeshire, and a fraudulent diamond investment scheme is exposed by a gemologist.

No preview

Ep 5

Pollen in a Field and Fibres in a Car Crash

Oct 29, 2021

29m

A body left in a field prompts the examination of pollen, establishing a new forensic discipline, and fibres fused with car wreckage prove who caused a fatal traffic collision.

No preview

Ep 6

DNA, Fibres and Bones

Nov 1, 2021

29m

After 32 years, expert fibre analysis helps bring the killer of two Brighton schoolgirls to justice, and the analysis of bones found on a Yorkshire moor helps find two killers.

Page 1 of 3