(Gresham, OR)  --  Police are looking for a man who's accused of stabbing his aunt to death at her home in Gresham.  Authorities say 36-year-old Teddy Stivahtis Jr. is accused in the death of 70-year-old Deanna Stivahtis, whose body was found last Thursday in a mobile home on Northeast Division Street.  Police say Teddy Stivahtis was seen driving his aunt's van away from her home before her body was found.  The van, a 1989, dark-green Dodge Caravan, hasn't been located.