A male caregiver took care of my grandmother before she died and he talked her into signing over her property and left her without a phone for hours and didn't feed her. How do I find out who this man was?

I'm so sorry. Please check with the local police - the man may have a record. Also, if your grandmother signed over the property, there must be a record of where to find him, as he "owns" it.
An elder law attorney should be able to assist you, as well. Somewhere there must be records of checks he cashed, etc. but I think legal help is your only option.

Good luck in untangling this. I hope you can prove something that puts him behind bars, as he's likely to do this with other elders, as well.
Carol