Chris Kyle, the sniper with 160 confirmed kills, was killed while at the Rough Creek Lodge in Erath County, Texas.
According to a report at TheBlaze.com, Kyle had been mentoring Marine veterans suffering from PTSD at a gun range when one of the people there snapped.
Kyle and one other person were killed in the rampage. A suspect, Eddie Ray Routh, was taken into custody by police after a brief chase.
Kyle had competed on the reality TV series "Stars Earn Stripes" with actor Dean Cain, and had earned the Silver Star during his service in Iraq.