[laininthewired]

But murder? What would you stand to gain?

You seem to be new to the lengths us officials go to keep people quiet lol. Just look at the many prominent political figures who commmited suicide/were murdered and their conflicting views with certain political parties in the US.

It seems you didn't think very logically here! 
You were talking about IRS, IRS is just a governmental institution that want to get back tax money. Killing wouldn't help anything about that (plus people working at the IRS are just simple officials doing their job, not some obscure agents)

Not only did McAfee evade taxes, he also supposed had dirt on many prominent political figures. I suppose that would be other agencies though.