A Madison man shot and killed his wife weeks ago and blew up their Southwest Side house on Wednesday as an attempt to cover up the homicide, Madison Police Chief Mike Koval said Sunday. Lee Anne Pirus, 50, was identified by the Dane County Medical Examiner’s Office as the body found amid the rubble of a house at 7806 Stratton Way. Koval said she was shot by her husband, 59-year-old Steven Pirus, “weeks, if not months ago.” He was arrested late Saturday on tentative charges of first-degree intentional homicide, arson and reckless endangerment, Koval said.