New details are emerging about 25-year-old Eddie Ray Routh, who shot and killed Chris Kyle and Chad Littlefield at a shooting range at Rough Creek Lodge Saturday.

On Sunday night, Routh was tasered and restrained in a chair after he became combative with jail staff trying to retrieve his dinner tray.

"After he ate dinner, he refused to give his tray back to the jailers,” Bryant said. “He became aggressive and tried to assault (the jail staff) so they tasered him.”

Routh is being kept in a cell isolated from other inmates. He was still reportedly being restrained Monday.

Routh, was a corporal in the Marines from June 2006 to January 2010. He was deployed to Iraq in 2007 and Haiti in 2010 and is currently listed as a reserve.

He is also reportedly suffering from PTSD (post traumatic stress disorder). Clint Burgess, a Tarrant County constable and friend of Kyle's, told the Associated Press that Jodi Routh, the suspect's mother, knew Kyle and contacted him about getting help for her son.

Routh's aunt, Sundae Hughes of Cedar Hill, told the Fort Worth Star Telegram that the family was trying to "gather it all in." She also said the family had been concerned about Routh for some time.

"My thoughts and prayers go first out to the families who lost loved ones. And my thoughts and prayers go out to Eddie's mom and dad, Jodi and Raymond," Hughes told reporters.

Varying reports indicate Routh had trouble adjusting to life after the military. One report indicates Routh's girlfriend called Dallas police about two weeks ago and Routh was issued a criminal trespassing warning before he was escorted away from the location. Another report indicated Routh had a separate charge for an alcohol-related offense in the metroplex.

Routh is being held at Erath County Jail on a $3 million bond. He has been charged with two counts of murder and one count of capital murder.