I left a home health agency in January for another job. I normally worked alone, at one of 4 clients' homes. I received a letter from the agency today that one of those 4 clients is alleging a felony-level theft of items from his/her home. The agency is cooperating with local police, and is asking us to do the same. Apparently they are also reviewing video from the client's home and from local pawn shops. I know I did not do it, and I never observed behavior like this from a coworker. What should I be doing right now?