A police spokesman said today that a man suspected of killing his wife yesterday has suffered from depression for months. Sergeant Jim Scott said 45-year-old Michael Grice has been taking medicine and that mental illness could be a factor in the shooting. Grice is being held without bond on a charge of first-degree murder in the slaying of his wife -- 43-year-old Sharon Grice. Scott said police found Sharon Grice`s body late Sunday morning on the floor of a bathroom upstairs. She had been shot once in the head. Investigators later recovered a twelve-gauge Benelli shotgun from the home. Grice was co-owner of a masonry company, and his wife was a secretary for Entergy Arkansas. The Grice`s children are both university students.