what do you do if you feel a will that you are named in has been voided, and you suspect fraud?

If the person has passed away, and a different will was registered with the Surogate's office, find out what that will says.  You can obtain a copy of the will once it is admitted to probate.  If the person is stll alive, ask them directly what happened to the will or share your concerns with them.  A will is not "final" until a person dies because anyone can change their mind up to the point of deaht.