STEPHENVILLE, Texas (AP) — Jurors in Texas have rejected the insanity defense of a former Marine in the shooting deaths of famed "American Sniper" author Chris Kyle and another man.

After a two-week trial, jurors convicted Eddie Ray Routh on Tuesday night in the 2013 slayings of Kyle and his friend Chad Littlefield at a Texas shooting range.

Routh showed no reaction as a judge sentenced him to life in prison without parole. As one of his victim's siblings called him an "American disgrace," he looked back at the man intensely but didn't otherwise react.

Routh's capital murder conviction capped an emotional trial in which prosecutors painted the 27-year-old as a troubled drug user who knew right from wrong. Defense attorneys said he was suffering from psychosis at the time.