I don't buy that for a second.
Which gang/criminals goes after a witness for testifying in a case against a cop?.....which gang actually gives a shit if he mentioned a random time, he got shot at without mentioning names?......Only if its a mafia, they will give a shit.
I see that the guy shot em/killed his friend was out on bond......so this guy goes out on bond and decides to get revenge on this dude, who just happened to come out on tv, and says the apartment/room he lives in, thus his criminal nemesis finds out

...........what are the odds of that? Straight out of a movie.
Sorry, but I don't buy that a shitty street gang did this or a some crazy guy out on bail did this.
This kind of crazy shit, is what I expect from an organized org.......kind of l like a police department who protected one of their own, in a situation that was pretty much defenseless.....and it worked!!! She got 10 years(5 years at best).......Its not out of the realm of possibility that they killed the witness.
It would be the perfect crime on top a of perfect crime........For all we know, Amber was just a hitwoman, send on a hit by his sextbuddy against a guy who just happened to live in the same apartment.....They decided, that "acting" like it was wrong apartment was the perfect excuse...it worked.
Now sext buddy and the corrupt part of the dallas pd is out for blood.......or maybe it was the guy out on bail, who was out for revenge, and just happened to see the witness on tv, and learned the exact apartment/number he lived ln lol