FAQ for
Michael Clayton (2007)

No, it is an original story.

SPOILER WARNING!

At the end of the movie, Karen is talking to Michael Clayton, who is secretly taping the conversation. After he leaves her, detectives come to arrest her. What exactly did she admit to? She never explicitly admits to having Arthur killed, or was it enough that she offered to bribe Michael?

She committed bribery, that's first and foremost. But also she opens the door for the company to get sued for negligence. And I know at least in the UK she could also open the door for corporate manslaughter, I don't know if the US has that law too. But there's also some crime I think for being aware of the memo and then never reporting it to the authorities. That is an ethical concern but it is also governed by law I think as well.

And though she never explicitly implicated herself for murder, it is probably enough evidence for arrest and a warrant to investigate her.