Update II: Tweedy responds in a statement to Paste:
“I know exactly as much as everyone else does. I’ve read the news and I honestly have no idea what these claims are based on. It was such a long time ago. Aside from everything else, I’m being sued for not paying someone for appearing in a movie I didn’t produce. Go figure. I am truly sad it has come to this. I am equally convinced, however, that I have done nothing wrong and that this will be handled fairly and swiftly.”
Update III: Chicagoist has the full text of the public filing.