He's already been ruled out. She succumbed to her injuries. Cops are looking at robbery as the motive.
That's just what they're saying right now. This early in the investigation I can guarantee you that they haven't even begun to look at the husband. The detectives will look at finances, cell phone records to include text messages, credit card statements, computer hard drives and a whole lot more. No competent police department rules out the husband before the body is cold.