Baton Rouge Gunman Left Online Trail

Authorities are investigating prolific social media use by former Marine Gavin Long.
1:33 | 07/18/16

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Transcript for Baton Rouge Gunman Left Online Trail
We are also learning much more about the gunman a military veteran a former marine who recently moved to change his name ABC's chief investigative correspondent Brian Boston. It's a tough cookies but it's a powerful war and most of the times when you won't piece you've got to go to war. With a jazz soundtrack in the background the Baton Rouge killers camp and law and posted this bizarre yet chilling video online. JEF. Five Dallas police officers were shot dead. The brother killing the police. Ambulance and it. That's just justice. Just hours before Sunday's deadly ambush along a former marine who served in Iraq. Posted this Twitter message just because you shed your physical body doesn't mean you're dead. Today in Kansas City had no comment none of long's family or neighbors seem to want to talk about it. Police say he left here for Baton Rouge last week in a rental car but his road to the deadly attack included an affinity. For a little known extremist black separatist group. As part of that. Long actually sought to legally change his name last year to Kosovo. As a member of what he called the wash it's all a nation or try. What is soldiers. With the war years. And Brian Ross is with us here tonight Brian authorities said there was just. One shooter here but they are investigating tonight whether or not there were any accomplices who might try to help him. Lester they discovered after he died someone continue to post on his FaceBook page they don't know tonight they say whether that was a hoax or a possible accomplice at -- Brian Ross with us again tonight Brian thank you.

This transcript has been automatically generated and may not be 100% accurate.

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