Is there a way to deny someone their part of a will?

There are three heirs in my grandmother's will. Myself, and two uncles. One of the uncles is the executor and the other is the uncle which I am concerned with. He stole very large amounts of money, appliances, and medication from my grandmother on three separate occasions in the passed year, one resulting in Adult Protective Services coming in and forcing him from the home, however, my grandmother did not press charges. She did mean to remove him from the will after that, but died recently before she was able to make the change. Is there a way for my uncle who is the executor to remove him from the will? And if so, what documents do we need to support our case?