'Till Death Do Us Part

The officer doesn't observe any other possible suspects and takes you into the police station for questioning. The two of you enter an grim, gloomily-lighted room. He points to a chair, and you slowly walk over and sit down, in anticipation for your inevitable doom. The officer introduces himself as Philip, and tells you that he and your husband collaborated at the station many times.
"Mrs. Welter, I'm very sorry for your loss," the officer remarked.
"Thank you, today feels so surreal," you reply, staring into space.
"Do you know how your husband died?" he asked.
"I'm sorry, I have no recollection of last night," you confess. He glances towards a mirror behind you, but his eyes dart quickly back to you.
“What was your relationship stable with your husband? Was there any reason to believe you could've committed this crime?” he asks. How do you respond?