Dead is only one way to hurt people. And the hurt wouldn’t necessarily come now. And there are a lot of other people who could be seen as threats whether they are or not.
If Rich was indeed murdered for leaking emails, I’m confident we’re not dealing with common street gangs or mafia style hits on multiple targets. If Rich’s folks or family got murdered, targeted for harassment or whatever, it would be block buster front page stuff. I’m very confident the perpetrators would know this too.