How does Dubus characterize Strout, Fowler, and Willis? In "Killings"

Matt Fowler is the main character of the story.  He is, on
first appearance, a normal middle aged man who works to support his family and loves his
three grown children.  Through nighttime conversations with his wife, the audience sees
that Fowler, in a very human way, is unable to share his real thoughts and feelings with
his wife.  However, it is assumed that she understands this about him and what is not
said between them does not need to be said.

Willis, a
restaurant owner and Fowler's slightly older and shorter friend, is not given as much
description in the story.  He is an accomplice to well planned murder of Strout, and as
such, he comes across (though briefly) as a straightforward man who does what he
believes needs to be done.  He and Fowler don't seem to speak much in the course of the
story, indicative of a somewhat typical male characterization.  Like Fowler, Willis
takes care of his wife at home and seems okay with the fact that he is hiding a secret
from her.

Finally, Richard Strout, is the cold-blooded
killer of Frank Fowler.  Upon description of his high school and early college days he
seems to be a bit of a bully.  He's an athlete who fails out of school and cannot even
take over the business his father would practically hand over to him.  This initial
picture is one that is pitiable, but little else.  Upon description of the how and why
behind his initial murder, Strout is characterized as heartless and prone to a quick
temper.  On the night of his own death, however, as he and Fowler move throughout
Strout's home, a somewhat surprising characterization follows.  His home is described as
neat, clean, well organized, and somewhat empty.  It is almost as if he is a Type-A
bachelor who lost himself one night and murdered the man who was sleeping with his wife
in a fit of rage that was taken one step beyond perhaps even what Strout himself knew he
was capable of.