A Texas sheriff says the man charged with killing a former Navy SEAL and his friend was shocked with a stun gun and restrained in his jail cell after becoming aggressive.

Erath County Sheriff Tommy Bryant says 25-year-old Eddie Ray Routh is on suicide watch.

Bryant says Routh also appeared ready to assault jailers Sunday night when they entered Routh's solitary confinement cell because he refused to return his food tray. Bryant says after using the stun gun once, jailers put Routh in a chair that restrains his arms and legs.