It looks like he was packing his suitcase to leave before you killed him?

Really, it looks like a common White-footed mouse (Peromyscus leucopus).

Hantavirus is a real disease, but less common than say, Shark bites. Note the following statistics are covering a 17 year period. And note they are all western states. Many rodent species can carry Hantavirus, but you really have to play with their poo a lot to catch it. Is there any chance you would like to get a cat?

As of July 2010, eight states had reported 30 or more cases of Hantavirus since 1993 - New Mexico (84), Colorado (70), Arizona (62), California (42), Washington (41), Texas (37), Utah (31) and Montana (30). Other states reporting a significant number of cases include Idaho (16), Kansas (15), South Dakota (15), and North Dakota (12). With only 11 cases, Oregon has a notably lower attack rate overall and relative to population, compared to other Western states. [Source: Wikipedia]