@Tom Linnik
Start with the probate office first, here called the county surrogate, and see if the estate has been probated first. Just because the property is still in the decedent's name doesn't mean the estate has not been probated.
If it hasn't been probated you will have to first track down the next of kin. In most cases it's the spouse and or the children of the deceased.
I'm a fan of doing my research first so that when I find someone, I have All of their questions answered about the property.
Is it in foreclosure? Are there any mortgages against the house? Is there any equity? Did the property get lost for back taxes? What's involved in the probate process. Do they need a lawyer and if so, who do they use? How much roughly will they pocket from the sale?
In researching the house you may find clues as to where other family members are. Have the right info available so that the heirs can make an informed decision.