Deed transfer deceased father to only child

my father passed with no will. he was single had no other children, and i was the administrator of the estate. i am trying to assume his mortgage, which i have been paying for the last couple years. the bank requires a warranty or quit claim deed (from my father to me) to be filed in order to process the assumption request. how do i do this? the forms for those deeds that i found online and at office supply stores do not seem meant for deceased people.