If you are concerned that someone may have stolen money or misappropriated other assets from your business or an estate then you should talk to a forensic accountant.
The forensic accountant can perform a fraud examination and determine if anything was stolen. If there was anything stolen the fraud examiner can prepare a report quantifying the amount of theft, how it was done and who was the perpetrator.
This report can be given to law enforcement or your attorney to assist them in their work.