Summary: Headlines for April 01, 2013; Texas DA Killed Two Months After Deputy Shot Dead; Aryan Brotherhood Probed in Killings; Prosecutor Seeks Stay of Execution for Texas Prisoner Duane Buck, Sentenced to Death for Being Black; Texas Prosecutor Linda Geffin, Victim of Brutal Attack at Home, on the Killing of DA Mike McLelland; ExxonMobil Tar Sands Oil Pipeline Ruptures in Arkansas as Obama Ponders Fate of Keystone XL
