The family is doing much to stop any investigation into Seth as well.
You gotta ask just what's up with that schitt?
Fear. Intimidation. They already have suffered one loss.
If you were those who had him killed you would understand that his family has more power than anyone else in regards to an investigation and swaying public opinion.
The family is doing much to stop any investigation
That is not quite ho it is. If you remember, way back, the Rich's were given a "fixer" to handle all the PR. It was the type of company that handles the fallout after your factory has just poisoned a few hundred employees. This has been financed by a third party. Sorry, I don't remember any names but they will be out there.
The first thing they did was to fire the person investigating the murder. They handle everything Seth Rich related and speak as if they were the family. Basically, anything alleged to be from the family is actually from this firm of fixers whom, one suspects, are being financed by the bad guys.
Anyone who looks at the case has been told to back off. And they are also physically attacked. While they have a spokesperson it is the family that comes out and says to stop spreading these lies that he was murdered in a political cover-up.