I went to the prayer vigil held outside the store last night, and there were a few dozen people present. A lot of them were from the university, some were clergymen and neighbors, and the owner and other clerks spoke.
Everyone, to a person, said that Amarasingham was one of the gentlest, nicest people they'd ever met. Which you expect, to some extent. It's pretty rare that someone will come to these vigils and regale you with tales about the deceased being a jerk. But I really got the sense that Amarasingham was as decent as everyone said.
Besides his job at Inner City Oil, he had a job doing IT support at UMKC. He studied electrical and computer engineering, and if he'd lived, he would have graduated this spring.