Eddie Ray Routh is heading to prison for the killing of "American Sniper" subject Chris Kyle and his fellow veteran friend, and he may be in for an extra tough time.

After a Texas jury rejected the defense's plea for insanity on grounds that Routh suffers from schizophrenia, "Lone Survivor" subject Marcus Luttrell had some choice words for the killer.

The former United States Navy SEAL thinks Routh will be all but safe when he gets to prison.