A 31-year-old man was arrested Wednesday night in connection with the killing of a 19-year-old University of Washington student, police say. The 31-year-old turned himself in to the Bellevue Police Department around 10:20 p.m., said Seattle police spokesperson Brian Pritchard. Bellevue police then handed him over to Seattle police, and he was booked into King County Jail.  This is the man whom police shared photos of Wednesday afternoon, Pritchard said. The images were taken from the apartment building in the off-campus student housing complex, Nordheim Court, where the 19-year-old transgender woman was stabbed to death in a laundry room Sunday night, Pritchard said.  It is unknown if the suspect and victim had any connection or what the motivation for the killing might have been. An air of fear had settled over many University of Washington students in the days after the killing. Students banded together. They offered to do laundry together and walk to and from classes in groups.…