The family lawyer can say what he wants, I've been spending the last hour searching United States Code and can't find anything about it, so it's unlikely that federal law says that.
He was not executed, he was shot after pointing a gun at people, that's justifiable homicide. The officers in question did not execute a no-knock warrant at the residence, they did not force entry, they didn't even have a warrant. no intention to search anything, they simply knocked at the door. tell me if the guy had pointed a gun at girl scouts selling cookies would you be taking his side? it doesn't matter what time of day it is, pointing a gun people you're not legally justified to shoot is a bad idea, and is a crime. would a reasonable person fear for their life if while they're being peaceful a gun points at their head? most certainly.
So your idea is to believe the one girlfriend then over the words of the cops, and criminally charge them and destroy their careers with no corroborating evidence? that sounds like you don't support due process for police, so you believe police could be held to a different standard then a civilian?
Of course she didn't see him with the gun, if she did she wouldn't be able to sue the department and push for a settlement. While not explicit stated in the article, those cops would already be in firing proceedings if a gun or something that looked like a gun was not recovered at the scene.
Suspects gun retrieved at scene? If no then the officers lied or are incompetent, charge with manslaughter, if yes (which is most likely) then the girl is lying and should be charged with making a false statement to investigators.
and take a look at this
"If the name of the law enforcement agency was announced, do you think this could've been prevented?" asked WFTV reporter Ryan Hughes.
"Well, based upon what we found inside his home -- drugs, scales, pipes, baggies -- I can't answer that. I don't know what he thought," Herrell said. "
http://www.wftv.com/news/news/local/deputy-involved-shooting-lake-county/nPtDq/
What's that sound like to you? a drug dealer maybe? Well maybe he knew it was the cops all along and decided he didn't want to go to prison. I have a hard time believing a 20 year old girlfriend of a man who's minor flaw was carrying all the required drug dealing equipment over the word of three sheriff's deputies who didn't even open his door.