Inheritance by a Non-Jew

דברים פרק ב ט כִּי לִבְׁנֵּי-לוֹט נָתַתִּי אֶּת-עָר יְׁרֻ ש ָּה :
אמר ר' חייא בר אבא אמר ר' יונתן, נכרי יורש את אביו דבר תורה (קדושין י "ח א')

T.T. Clearly from here the laws of inheritance include non-Jews. The practical difference would be in cases of the non-Jew being required to pay the debts of his deceased father or to pay for the claimed deposited items of others against his deceased father.
Rambam explains that inheritance only comes from the father, but to other relatives of a non-Jew one goes according to the local customs.
T.T. The laws of inheritance in the Torah are preceded by אל בני ישראל תדבר and thus, the inheritance by other relatives only applies to the Jewish people.