Two years before Dr. Cerina Fairfax was shot and killed by her husband, former Virginia Lt. Gov. Justin Fairfax, she had tried to leave him. Six years before police say he fatally shot his wife and himself, Justin Fairfax had been the tie-breaking vote on state legislation that allows temporary confiscation of guns from people deemed at-risk of harming themselves or others. “This is a terribly painful irony,” Del. Rip Sullivan, D-Fairfax, said. …