Gary Oldman/Kevin Bacon movie from 1988. It was on the freebie movies so I started watching it.

Oldman plays a defense attorney who gets an acquittal for the Bacon character. The accused then goes out and commits the exact same crime, rape and murder. The attorney raised the issue of the witness not knowing if she had a box of diapers to discredit her testimony and the new victim is found with one of the same brand in her mouth.

So it's obvious who did it. Then the accused calls the lawyer and asks him to meet him at a park late at night. He wants to discuss a retainer. The attorney goes there and finds a third body, killed that night in the same manner as the others. The body was burned to eliminate physical evidence (whatever.)

The attorney lies about the reason he went to the park when the police question him.

Obviously if he told them why he was there, it would implicate his former client.

But since he has knowledge that implicates his client in a crime, is he under any obligation to protect the client?

The fact that he went to the park to meet his client is not attorney-client privileged. It does disclose a communication from a prospective client seeking legal advice.