Opening statements were heard Wednesday in the case against Eddie Ray Routh, 27, who admitted to killing “American Sniper” Chris Kyle and Chad Littlefield two years ago.

Eddie Ray Routh

Erath County Sheriffs Office

The trial against Eddie Ray Routh began in Texas on Wednesday, with the prosecutor claiming in his opening statement that Routh drank whiskey and smoked pot before opening fire on "American Sniper" Chris Kyle and his friend Chad Littlefield at a gun range two years ago.

Routh, 27-years-old and a former marine with a history of suffering from PTSD, then allegedly stole Kyle's car and drove to his sister's house, where he confessed to the murders saying that he had to shoot them because "he couldn't trust them, so he killed them before they could kill him," Erath County District Attorney Alan Nash said.

Kyle was the author of the 2012 memoir American Sniper, which was turned into a massively successful 2014 film of the same name.

Alan Routh

Screenshot / Via nbcnews.com

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