erm, how about considering what is asked?
How did the cop know it was the husband...
that he just arrested
that killed the wife
that ...
?
I would say we are just assuming things.
How did the cop know it was the husband? Because it said so on his ID. so there
And the wife wrote "it wa" on the walls.
She meant to write it was my husband who killed me, but she died after 4 letters
(ok, I got nothing either)