The man charged with shooting Chris Kyle, the author of "American Sniper," and Chad Littlefield is on suicide watch, according to Erath County Sheriff Tommy Bryant.
The suspect in the shootings, Eddie Ray Routh, is now in solitary confinement and on suicide watch in an Erath County jail.
According to Bryant, Routh became aggressive with jail guards after refusing to hand over his dinner tray. After several minutes, guards had to open the cell to go in and retrieve the tray.
At that time, guards said, Routh became aggressive and they had to use a stun gun to subdue him.
Bryant say they have heard of death threats against Routh and that they will do everything them can to keep him safe.
Routh is scheduled to stay in the jail until a plea deal is reached or a verdict and sentence come down at a trial.
Routh, a 25-year-old veteran, may have been working with Kyle to overcome Routh's personal struggles. The U.S. military confirmed Sunday that Routh was a corporal in the Marines from June 2006 to January 2010. He was deployed to Iraq in 2007 and Haiti in 2010. His current duty status is listed as reserve.
Routh's family and neighbors had differing opinions when reporters contacted them about his background.
Routh is charged with two counts of capital murder and is being held on $3 million bond.