What do I file to get rid of an LLC member? ie I think we messed up...

About a year ago, I bought out an LLC member for $100.00(don't ask, that is what his value was in the company). We have notorized purchase documents and cancelation notification of his membership in the LLC.

We gave him the schedule-k for that year. My wife and I are the only llc members left in the company. I read two days ago that I should have filed something with the IRS stating that this person left. My accountant did not catch this and as of about 3 months ago that accountant passed away so I can't ask her.

What do I need to do to get square with the IRS? Let me reask the question. If a member is no longer a member of an LLC, what do we need to do IRS wise?

Thanks!