I'm so sorry, OP. Fingers crossed that you do get to discover the truth about what happened to Dom and his colleague. It won't be easy, but please keep talking to the embassy and make them give you answers. This is no fleeting matter; it is the lives and deaths of two people who mean a lot to their families.
Unfortunately, too many journalists meet an end like this.
And I hate what is happening in, and to, Brazil. Beautiful country, wonderful people, I loved my trips there, but what a shitful abomination of a government.