Today I had a 'first' in my professional career.
There is a critical witness who can completely exonerate my client. I don't have detailed contact information on him, but I have a ballpark estimate. So I put my card on the door of every. single. door. in the area. And then posted a ghetto-ass scribbled note where everyone in that area has to walk by to see it, asking for witnesses to call my #.
It's a bit embarrassing, the method, but if it works then it's worth it, and if it doesn't work then at least I know I did all I could, and didn't let shame get in the way.