What was this show called?

[Lorddenning1]

My other half has been trying to think of the name of a show that was on around 20 years ago.
It was a part series, not sure what channel and it involved some guys beating someone up badly (one of the men is a police officer) and he ends up being the lead investigator of the case and tries to hide the evidence of what he did but ends up getting caught in the end.
The actor has black hair and has been in loads of things, that's all I got out of him. Does anyone remember the name of that show?

Back hair with a bushy quiff he said the actor had

Marking my place as that sounds really familiar!

Now he can't remember if it was 20 years ago now could of been sooner

The last season of unforgotten had a story like that

Just had a look and no it's not that.

An episode of silent witness maybe?

No it was a 4/6 parter.

Between the lines?

@Netaporter or 'Between the Sheets' as it is called on our house 😂 Tried to rewatch recently and it has not stood the test of time!.

Cracker?

@willstarttomorrow quite 😂😂😂

It sounds a bit like Good Cop. Could the man with black hair be Warren Brown? Stephen Graham was in it too.