DAVENPORT, Iowa (AP) -

An attorney for an Iowa man charged with killing his pregnant wife says investigators rushed to judgment after discovering his client was trading sexual text messages with another woman.

Attorney Gerald Feuerhelm told jurors in an opening statement Tuesday that Seth Techel is the victim of "tunnel vision" and didn't kill Lisa Techel.

He said investigators ignored leads that pointed to a mentally ill neighbor, and didn't disclose that Lisa Techel had a lengthy sexual affair with a married man.

Prosecutor Scott Brown said that Seth Techel was the last person that investigators wanted to be responsible for killing Lisa, the daughter of a sheriff's deputy. Brown said Seth Techel was the only person who had access to the shotgun that he used to "gun her down" in her sleep.