A mother's anger at a plea deal for her son's killer may push lawmakers to increase the penalty for second-degree murder by five years or more.The change could lead to fewer capital murder cases and thereby save the state millions in indigent defense costs, which have climbed dramatically in recent years.The state's district attorneys association has gotten behind a campaign that would place second-degree murder in the second-highest felony classification, just under the category that includes first-degree murder, which carries a death sentence or life without parole.Under current law, a second-degree murder conviction carries a minimum sentence of nearly eight years in prison.