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STEPHENVILLE, TX - FEBRUARY 11: Former Marine Cpl. Eddie Ray Routh walks to his seat during the capital murder trial of former Marine Cpl. Eddie Ray Routh at the Erath County Donald R. Jones Justice Center February 11, 2015 in Stephenville, Texas. February 11, 2015 in Stephenville, Texas. Eddie Ray Routh, 27, of Lancaster, Texas is charged with the 2013 deaths of former Navy SEAL Chris Kyle and his friend Chad Littlefield at a shooting range near Glen Rose, Texas.
STEPHENVILLE, TX - FEBRUARY 11: Former Marine Cpl. Eddie Ray Routh walks to his seat during the capital murder trial of former Marine Cpl. Eddie Ray Routh at the Erath County Donald R. Jones Justice Center February 11, 2015 in Stephenville, Texas. February 11, 2015 in Stephenville, Texas. Eddie Ray Routh, 27, of Lancaster, Texas is charged with the 2013 deaths of former Navy SEAL Chris Kyle and his friend Chad Littlefield at a shooting range near Glen Rose, Texas.

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Routh's sister takes stand in 'American Sniper' trial

Eddie Ray Routh's sister and former girlfriend testified about his behavior before and after the fatal shootings. CNN's Ed Lavandera reports.

Routh's sister takes stand in 'American Sniper' trial

Eddie Ray Routh's sister and former girlfriend testified about his behavior before and after the fatal shootings. CNN's Ed Lavandera reports.