The statute of limitations varies by state. You should contact and attorney in WI as soon as possible to discuss this.
*PLEASE READ THIS BEFORE YOU COMMENT, EMAIL OR CONTACT ME. I am only licensed in Washington. Answering this question does not create an attorney-client relationship. This answer does not constitute legal advice.
The Statute of limitation in Wisconsin is three years. In Wisconsin Medical Malpractice cases are so difficult and expensive that fewer than 100 were filed last year, and this is trending downward. This means that fewer lawyers are handling these cases and it is unlikely you can find an attorney to help you. You should contact the treating facility and notify them of your concerns. They typically will investigate the doctor. I am very sorry for your loss.
This is not intended as legal advice. It is only provided for educational purposes and cannot be relied upon as legal advice. Further no attorney client relationship is or has been formed by answering this question.
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